---
type: api
title: Create a follower
description: Create a cross-cluster replication follower index that follows a specific leader index.
url: https://www.elastic.co/docs/api/doc/elasticsearch/v8/operation/operation-ccr-follow
resource: https://www.elastic.co/docs/api/doc/elasticsearch/v8/operation/operation-ccr-follow
products:
  - Elasticsearch
---

# Create a follower

Authentication: required

Availability: Generally available since 6.5

## Paths

- `PUT` `/{index}/_ccr/follow`

#### Path parameters

- `index` (string) — required
  The name of the follower index.

## Description

Create a cross-cluster replication follower index that follows a specific leader index.
When the API returns, the follower index exists and cross-cluster replication starts replicating operations from the leader index to the follower index.

## Query string parameters

- `master_timeout` (union oneOf · default: 30s) — optional
  Period to wait for a connection to the master node.
  Values: `-1`, `0`
- `wait_for_active_shards` (union oneOf · default: 0) — optional
  Specifies the number of shards to wait on being active before responding. This defaults to waiting on none of the shards to be
active.
A shard must be restored from the leader index before being active. Restoring a follower shard requires transferring all the
remote Lucene segment files to the follower index.
  Values: `all`, `index-setting`

## Request body

`application/json`

- `data_stream_name` (string) — optional
  If the leader index is part of a data stream, the name to which the local data stream for the followed index should be renamed.
- `leader_index` (string) — required
  The name of the index in the leader cluster to follow.
- `max_outstanding_read_requests` (number) — optional
  The maximum number of outstanding reads requests from the remote cluster.
- `max_outstanding_write_requests` (number) — optional
  The maximum number of outstanding write requests on the follower.
- `max_read_request_operation_count` (number) — optional
  The maximum number of operations to pull per read from the remote cluster.
- `max_read_request_size` (number | string) — optional
  The maximum size in bytes of per read of a batch of operations pulled from the remote cluster.
- `max_retry_delay` (union oneOf) — optional
  The maximum time to wait before retrying an operation that failed exceptionally. An exponential backoff strategy is employed when
retrying.
  Values: `-1`, `0`
- `max_write_buffer_count` (number) — optional
  The maximum number of operations that can be queued for writing. When this limit is reached, reads from the remote cluster will be
deferred until the number of queued operations goes below the limit.
- `max_write_buffer_size` (number | string) — optional
  The maximum total bytes of operations that can be queued for writing. When this limit is reached, reads from the remote cluster will
be deferred until the total bytes of queued operations goes below the limit.
- `max_write_request_operation_count` (number) — optional
  The maximum number of operations per bulk write request executed on the follower.
- `max_write_request_size` (number | string) — optional
  The maximum total bytes of operations per bulk write request executed on the follower.
- `read_poll_timeout` (union oneOf) — optional
  The maximum time to wait for new operations on the remote cluster when the follower index is synchronized with the leader index.
When the timeout has elapsed, the poll for operations will return to the follower so that it can update some statistics.
Then the follower will immediately attempt to read from the leader again.
  Values: `-1`, `0`
- `remote_cluster` (string) — required
  The remote cluster containing the leader index.
- `settings` (object) — optional
  Settings to override from the leader index.
  - `index` (object) — optional — recursive
    Same fields as `settings`
  - `mode` (string) — optional
  - `routing_path` (union string | string[]) — optional
  - `soft_deletes` (object) — optional
    - `enabled` (boolean · default: true) — optional
      Indicates whether soft deletes are enabled on the index.
    - `retention_lease` (object) — optional
      The maximum period to retain a shard history retention lease before it is considered expired.
Shard history retention leases ensure that soft deletes are retained during merges on the Lucene
index. If a soft delete is merged away before it can be replicated to a follower the following
process will fail due to incomplete history on the leader.
      - `period` (union oneOf) — required
        Values: `-1`, `0`
  - `sort` (object) — optional
    - `field` (union oneOf) — optional
      One of: `string[]` or `string`
    - `order` (union enum | enum[]) — optional
      

Supported values include: `asc` (or `ASC`), `desc` (or `DESC`)
      Values: `asc`, `ASC`, `desc`, `DESC`
    - `mode` (union enum | enum[]) — optional
      

Supported values include: `min` (or `MIN`), `max` (or `MAX`)
      Values: `min`, `MIN`, `max`, `MAX`
    - `missing` (union enum | enum[]) — optional
      

Supported values include: `_last`, `_first`
      Values: `_last`, `_first`
  - `number_of_shards` (number | string · default: 1) — optional
  - `number_of_replicas` (number | string · default: 0) — optional
  - `number_of_routing_shards` (number) — optional
  - `check_on_startup` (enum · default: false) — optional
    Values: `true`, `false`, `checksum`
  - `codec` (string · default: LZ4) — optional
  - `routing_partition_size` (number | string · default: 1) — optional
  - `load_fixed_bitset_filters_eagerly` (boolean · default: true) — optional
  - `hidden` (boolean | string · default: false) — optional
  - `auto_expand_replicas` (union string · default: false) — optional — nullable
  - `merge` (object) — optional
    - `scheduler` (object) — optional
      - `max_thread_count` (number | string) — optional
      - `max_merge_count` (number | string) — optional
  - `search` (object) — optional
    - `idle` (object) — optional
      - `after` (union oneOf · default: 30s) — optional
        Values: `-1`, `0`
    - `slowlog` (object) — optional
      - `level` (string) — optional
      - `source` (number) — optional
      - `reformat` (boolean) — optional
      - `threshold` (object) — optional
        - `query` (object) — optional
          - `warn` (union oneOf) — optional
            Values: `-1`, `0`
          - `info` (union oneOf) — optional
            Values: `-1`, `0`
          - `debug` (union oneOf) — optional
            Values: `-1`, `0`
          - `trace` (union oneOf) — optional
            Values: `-1`, `0`
        - `fetch` (object) — optional
          - `warn` (union oneOf) — optional
            Values: `-1`, `0`
          - `info` (union oneOf) — optional
            Values: `-1`, `0`
          - `debug` (union oneOf) — optional
            Values: `-1`, `0`
          - `trace` (union oneOf) — optional
            Values: `-1`, `0`
  - `refresh_interval` (union oneOf · default: 1s) — optional
    Values: `-1`, `0`
  - `max_result_window` (number | string · default: 10000) — optional
  - `max_inner_result_window` (number · default: 100) — optional
  - `max_rescore_window` (number · default: 10000) — optional
  - `max_docvalue_fields_search` (number · default: 100) — optional
  - `max_script_fields` (number · default: 32) — optional
  - `max_ngram_diff` (number · default: 1) — optional
  - `max_shingle_diff` (number · default: 3) — optional
  - `blocks` (object) — optional
    - `read_only` (boolean | string) — optional
    - `read_only_allow_delete` (boolean | string) — optional
    - `read` (boolean | string) — optional
    - `write` (boolean | string) — optional
    - `metadata` (boolean | string) — optional
  - `max_refresh_listeners` (number) — optional
  - `analyze` (object) — optional
    Settings to define analyzers, tokenizers, token filters and character filters.
    - `max_token_count` (number | string · default: 10000) — optional
  - `highlight` (object) — optional
    - `max_analyzed_offset` (number · default: 1000000) — optional
  - `max_terms_count` (number · default: 65536) — optional
  - `max_regex_length` (number · default: 1000) — optional
  - `routing` (object) — optional
    - `allocation` (object) — optional
      - `enable` (enum) — optional
        Values: `all`, `primaries`, `new_primaries`, `none`
      - `include` (object) — optional
        - `_tier_preference` (string) — optional
        - `_id` (string) — optional
      - `require` (object) — optional
        Assign the index to a node whose attribute has all of the given values.
Each key is a node attribute: one of the built-in attributes `_name`, `_host_ip`, `_publish_ip`, `_ip`, `_host`, `_id` and `_tier`, or a custom node attribute.
Each value is a comma-separated string or an array of strings, and can use wildcards.
      - `initial_recovery` (object) — optional
        - `_id` (string) — optional
      - `disk` (object) — optional
        - `threshold_enabled` (boolean | string) — optional
    - `rebalance` (object) — optional
      - `enable` (enum) — required
        Values: `all`, `primaries`, `replicas`, `none`
  - `unassigned` (object) — optional
    - `node_left` (object) — optional
      - `delayed_timeout` (union oneOf · default: 1m) — optional
        The amount of time to wait for a node that has left before assuming its
shards are permanently missing and starting to allocate replacement replicas.
        Values: `-1`, `0`
  - `gc_deletes` (union oneOf · default: 60s) — optional
    Values: `-1`, `0`
  - `default_pipeline` (string · default: _none) — optional
  - `final_pipeline` (string · default: _none) — optional
  - `lifecycle` (object) — optional
    - `name` (string) — optional
      The name of the policy to use to manage the index. For information about how Elasticsearch applies policy changes, see Policy updates.
    - `indexing_complete` (boolean | string · default: false) — optional
      Indicates whether or not the index has been rolled over. Automatically set to true when ILM completes the rollover action.
You can explicitly set it to skip rollover.
    - `origination_date` (number · default: 0) — optional
      If specified, this is the timestamp used to calculate the index age for its phase transitions. Use this setting
if you create a new index that contains old data and want to use the original creation date to calculate the index
age. Specified as a Unix epoch value in milliseconds.
    - `parse_origination_date` (boolean) — optional
      Set to true to parse the origination date from the index name. This origination date is used to calculate the index age
for its phase transitions. The index name must match the pattern ^.*-{date_format}-\\d+, where the date_format is
yyyy.MM.dd and the trailing digits are optional. An index that was rolled over would normally match the full format,
for example logs-2016.10.31-000002). If the index name doesn’t match the pattern, index creation fails.
    - `step` (object) — optional
      - `wait_time_threshold` (union oneOf) — optional
        Time to wait for the cluster to resolve allocation issues during an ILM shrink action. Must be greater than 1h (1 hour).
See Shard allocation for shrink.
        Values: `-1`, `0`
    - `rollover_alias` (string) — optional
      The index alias to update when the index rolls over. Specify when using a policy that contains a rollover action.
When the index rolls over, the alias is updated to reflect that the index is no longer the write index. For more
information about rolling indices, see Rollover.
    - `prefer_ilm` (boolean | string · default: true) — optional
      Preference for the system that manages a data stream backing index (preferring ILM when both ILM and DLM are
applicable for an index).
  - `provided_name` (string) — optional
  - `creation_date` (union oneOf) — optional
    One of: `number` or `string`
  - `creation_date_string` (union oneOf) — optional
    One of: `string` or `number`
  - `uuid` (string) — optional
  - `version` (object) — optional
    - `created` (string) — optional
    - `created_string` (string) — optional
  - `verified_before_close` (boolean | string) — optional
  - `format` (number | string) — optional
  - `max_slices_per_scroll` (number) — optional
  - `translog` (object) — optional
    - `sync_interval` (union oneOf · default: 5s) — optional
      How often the translog is fsynced to disk and committed, regardless of write operations.
Values less than 100ms are not allowed.
      Values: `-1`, `0`
    - `durability` (enum · default: string) — optional
      Whether or not to `fsync` and commit the translog after every index, delete, update, or bulk request.

Supported values include:
  - `request` (or `REQUEST`): (default) fsync and commit after every request. In the event of hardware failure, all acknowledged writes
will already have been committed to disk.
  - `async` (or `ASYNC`): fsync and commit in the background every sync_interval. In the event of a failure, all acknowledged writes
since the last automatic commit will be discarded.
      Values: `request`, `REQUEST`, `async`, `ASYNC`
    - `flush_threshold_size` (number | string · default: 512mb) — optional
      The translog stores all operations that are not yet safely persisted in Lucene (i.e., are not
part of a Lucene commit point). Although these operations are available for reads, they will need
to be replayed if the shard was stopped and had to be recovered. This setting controls the
maximum total size of these operations, to prevent recoveries from taking too long. Once the
maximum size has been reached a flush will happen, generating a new Lucene commit point.
    - `retention` (object) — optional
      - `size` (number | string · default: 512mb) — optional
        This controls the total size of translog files to keep for each shard. Keeping more translog files increases
the chance of performing an operation based sync when recovering a replica. If the translog files are not
sufficient, replica recovery will fall back to a file based sync. This setting is ignored, and should not be
set, if soft deletes are enabled. Soft deletes are enabled by default in indices created in Elasticsearch
versions 7.0.0 and later.
      - `age` (union oneOf · default: 12h) — optional
        This controls the maximum duration for which translog files are kept by each shard. Keeping more
translog files increases the chance of performing an operation based sync when recovering replicas. If
the translog files are not sufficient, replica recovery will fall back to a file based sync. This setting
is ignored, and should not be set, if soft deletes are enabled. Soft deletes are enabled by default in
indices created in Elasticsearch versions 7.0.0 and later.
        Values: `-1`, `0`
  - `query_string` (object) — optional
    - `lenient` (boolean | string) — required
  - `priority` (number | string) — optional
  - `top_metrics_max_size` (number) — optional
  - `analysis` (object) — optional
    - `analyzer` (map string to oneOf) — optional
      Map values (union oneOf)
      One of:
      - **type: custom** (`type: custom`)
        - `type` (enum) — required
          Values: `custom`
        - `char_filter` (union string | string[]) — optional
        - `filter` (union string | string[]) — optional
        - `position_increment_gap` (number) — optional
        - `position_offset_gap` (number) — optional
        - `tokenizer` (string) — required
      - **type: fingerprint** (`type: fingerprint`)
        - `type` (enum) — required
          Values: `fingerprint`
        - `version` (string) — optional
        - `max_output_size` (number) — required
        - `preserve_original` (boolean) — required
        - `separator` (string) — required
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
      - **type: keyword** (`type: keyword`)
        - `type` (enum) — required
          Values: `keyword`
        - `version` (string) — optional
      - **type: nori** (`type: nori`)
        - `type` (enum) — required
          Values: `nori`
        - `version` (string) — optional
        - `decompound_mode` (enum) — optional
          Values: `discard`, `none`, `mixed`
        - `stoptags` (string[]) — optional
        - `user_dictionary` (string) — optional
      - **type: pattern** (`type: pattern`)
        - `type` (enum) — required
          Values: `pattern`
        - `version` (string) — optional
        - `flags` (string) — optional
        - `lowercase` (boolean) — optional
        - `pattern` (string) — required
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
      - **type: simple** (`type: simple`)
        - `type` (enum) — required
          Values: `simple`
        - `version` (string) — optional
      - **type: standard** (`type: standard`)
        - `type` (enum) — required
          Values: `standard`
        - `max_token_length` (number) — optional
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
      - **type: stop** (`type: stop`)
        - `type` (enum) — required
          Values: `stop`
        - `version` (string) — optional
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
      - **type: whitespace** (`type: whitespace`)
        - `type` (enum) — required
          Values: `whitespace`
        - `version` (string) — optional
      - **type: icu_analyzer** (`type: icu_analyzer`)
        - `type` (enum) — required
          Values: `icu_analyzer`
        - `method` (enum) — required
          Values: `nfc`, `nfkc`, `nfkc_cf`
        - `mode` (enum) — required
          Values: `decompose`, `compose`
      - **type: kuromoji** (`type: kuromoji`)
        - `type` (enum) — required
          Values: `kuromoji`
        - `mode` (enum) — optional
          Values: `normal`, `search`, `extended`
        - `user_dictionary` (string) — optional
      - **type: snowball** (`type: snowball`)
        - `type` (enum) — required
          Values: `snowball`
        - `version` (string) — optional
        - `language` (enum) — required
          Values: `Arabic`, `Armenian`, `Basque`, `Catalan`, `Danish`, `Dutch`, `English`, `Estonian`, `Finnish`, `French`, `German`, `German2`, `Hungarian`, `Italian`, `Irish`, `Kp`, `Lithuanian`, `Lovins`, `Norwegian`, `Porter`, `Portuguese`, `Romanian`, `Russian`, `Serbian`, `Spanish`, `Swedish`, `Turkish`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
      - **type: arabic** (`type: arabic`)
        - `type` (enum) — required
          Values: `arabic`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: armenian** (`type: armenian`)
        - `type` (enum) — required
          Values: `armenian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: basque** (`type: basque`)
        - `type` (enum) — required
          Values: `basque`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: bengali** (`type: bengali`)
        - `type` (enum) — required
          Values: `bengali`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: brazilian** (`type: brazilian`)
        - `type` (enum) — required
          Values: `brazilian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
      - **type: bulgarian** (`type: bulgarian`)
        - `type` (enum) — required
          Values: `bulgarian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: catalan** (`type: catalan`)
        - `type` (enum) — required
          Values: `catalan`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: chinese** (`type: chinese`)
        - `type` (enum) — required
          Values: `chinese`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
      - **type: cjk** (`type: cjk`)
        - `type` (enum) — required
          Values: `cjk`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
      - **type: czech** (`type: czech`)
        - `type` (enum) — required
          Values: `czech`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: danish** (`type: danish`)
        - `type` (enum) — required
          Values: `danish`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
      - **type: dutch** (`type: dutch`)
        - `type` (enum) — required
          Values: `dutch`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: english** (`type: english`)
        - `type` (enum) — required
          Values: `english`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: estonian** (`type: estonian`)
        - `type` (enum) — required
          Values: `estonian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
      - **type: finnish** (`type: finnish`)
        - `type` (enum) — required
          Values: `finnish`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: french** (`type: french`)
        - `type` (enum) — required
          Values: `french`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: galician** (`type: galician`)
        - `type` (enum) — required
          Values: `galician`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: german** (`type: german`)
        - `type` (enum) — required
          Values: `german`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: greek** (`type: greek`)
        - `type` (enum) — required
          Values: `greek`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
      - **type: hindi** (`type: hindi`)
        - `type` (enum) — required
          Values: `hindi`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: hungarian** (`type: hungarian`)
        - `type` (enum) — required
          Values: `hungarian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: indonesian** (`type: indonesian`)
        - `type` (enum) — required
          Values: `indonesian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: irish** (`type: irish`)
        - `type` (enum) — required
          Values: `irish`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: italian** (`type: italian`)
        - `type` (enum) — required
          Values: `italian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: latvian** (`type: latvian`)
        - `type` (enum) — required
          Values: `latvian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: lithuanian** (`type: lithuanian`)
        - `type` (enum) — required
          Values: `lithuanian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: norwegian** (`type: norwegian`)
        - `type` (enum) — required
          Values: `norwegian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: persian** (`type: persian`)
        - `type` (enum) — required
          Values: `persian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
      - **type: portuguese** (`type: portuguese`)
        - `type` (enum) — required
          Values: `portuguese`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: romanian** (`type: romanian`)
        - `type` (enum) — required
          Values: `romanian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: russian** (`type: russian`)
        - `type` (enum) — required
          Values: `russian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: serbian** (`type: serbian`)
        - `type` (enum) — required
          Values: `serbian`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: sorani** (`type: sorani`)
        - `type` (enum) — required
          Values: `sorani`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: spanish** (`type: spanish`)
        - `type` (enum) — required
          Values: `spanish`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: swedish** (`type: swedish`)
        - `type` (enum) — required
          Values: `swedish`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: turkish** (`type: turkish`)
        - `type` (enum) — required
          Values: `turkish`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
        - `stem_exclusion` (string[]) — optional
      - **type: thai** (`type: thai`)
        - `type` (enum) — required
          Values: `thai`
        - `stopwords` (union oneOf) — optional
          Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - `stopwords_path` (string) — optional
    - `char_filter` (map string to oneOf) — optional
      Map values (union oneOf)
      One of:
      - **string**
      - **CharFilterDefinition**
        One of:
        - **type: html_strip** (`type: html_strip`)
          - `type` (enum) — required
            Values: `html_strip`
          - `version` (string) — optional
          - `escaped_tags` (string[]) — optional
        - **type: mapping** (`type: mapping`)
          - `type` (enum) — required
            Values: `mapping`
          - `version` (string) — optional
          - `mappings` (string[]) — optional
          - `mappings_path` (string) — optional
        - **type: pattern_replace** (`type: pattern_replace`)
          - `type` (enum) — required
            Values: `pattern_replace`
          - `version` (string) — optional
          - `flags` (string) — optional
          - `pattern` (string) — required
          - `replacement` (string) — optional
        - **type: icu_normalizer** (`type: icu_normalizer`)
          - `type` (enum) — required
            Values: `icu_normalizer`
          - `version` (string) — optional
          - `mode` (enum) — optional
            Values: `decompose`, `compose`
          - `name` (enum) — optional
            Values: `nfc`, `nfkc`, `nfkc_cf`
          - `unicode_set_filter` (string) — optional
        - **type: kuromoji_iteration_mark** (`type: kuromoji_iteration_mark`)
          - `type` (enum) — required
            Values: `kuromoji_iteration_mark`
          - `version` (string) — optional
          - `normalize_kana` (boolean) — required
          - `normalize_kanji` (boolean) — required
    - `filter` (map string to oneOf) — optional
      Map values (union oneOf)
      One of:
      - **string**
      - **TokenFilterDefinition**
        One of:
        - **type: apostrophe** (`type: apostrophe`)
          - `type` (enum) — required
            Values: `apostrophe`
          - `version` (string) — optional
        - **type: arabic_stem** (`type: arabic_stem`)
          - `type` (enum) — required
            Values: `arabic_stem`
          - `version` (string) — optional
        - **type: arabic_normalization** (`type: arabic_normalization`)
          - `type` (enum) — required
            Values: `arabic_normalization`
          - `version` (string) — optional
        - **type: asciifolding** (`type: asciifolding`)
          - `type` (enum) — required
            Values: `asciifolding`
          - `version` (string) — optional
          - `preserve_original` (boolean | string) — optional
            If `true`, emit both original tokens and folded tokens. Defaults to `false`.
        - **type: bengali_normalization** (`type: bengali_normalization`)
          - `type` (enum) — required
            Values: `bengali_normalization`
          - `version` (string) — optional
        - **type: brazilian_stem** (`type: brazilian_stem`)
          - `type` (enum) — required
            Values: `brazilian_stem`
          - `version` (string) — optional
        - **type: cjk_bigram** (`type: cjk_bigram`)
          - `type` (enum) — required
            Values: `cjk_bigram`
          - `version` (string) — optional
          - `ignored_scripts` (enum[]) — optional
            Array of character scripts for which to disable bigrams.
            Values: `han`, `hangul`, `hiragana`, `katakana`
          - `output_unigrams` (boolean) — optional
            If `true`, emit tokens in both bigram and unigram form. If `false`, a CJK character is output in unigram form when it has no adjacent characters. Defaults to `false`.
        - **type: cjk_width** (`type: cjk_width`)
          - `type` (enum) — required
            Values: `cjk_width`
          - `version` (string) — optional
        - **type: classic** (`type: classic`)
          - `type` (enum) — required
            Values: `classic`
          - `version` (string) — optional
        - **type: common_grams** (`type: common_grams`)
          - `type` (enum) — required
            Values: `common_grams`
          - `version` (string) — optional
          - `common_words` (string[]) — optional
            A list of tokens. The filter generates bigrams for these tokens.
Either this or the `common_words_path` parameter is required.
          - `common_words_path` (string) — optional
            Path to a file containing a list of tokens. The filter generates bigrams for these tokens.
This path must be absolute or relative to the `config` location. The file must be UTF-8 encoded. Each token in the file must be separated by a line break.
Either this or the `common_words` parameter is required.
          - `ignore_case` (boolean) — optional
            If `true`, matches for common words matching are case-insensitive. Defaults to `false`.
          - `query_mode` (boolean) — optional
            If `true`, the filter excludes the following tokens from the output:
- Unigrams for common words
- Unigrams for terms followed by common words
Defaults to `false`. We recommend enabling this parameter for search analyzers.
        - **type: condition** (`type: condition`)
          - `type` (enum) — required
            Values: `condition`
          - `version` (string) — optional
          - `filter` (string[]) — required
            Array of token filters. If a token matches the predicate script in the `script` parameter, these filters are applied to the token in the order provided.
          - `script` (string) — required
            Predicate script used to apply token filters. If a token matches this script, the filters in the `filter` parameter are applied to the token.
        - **type: czech_stem** (`type: czech_stem`)
          - `type` (enum) — required
            Values: `czech_stem`
          - `version` (string) — optional
        - **type: decimal_digit** (`type: decimal_digit`)
          - `type` (enum) — required
            Values: `decimal_digit`
          - `version` (string) — optional
        - **type: delimited_payload** (`type: delimited_payload`)
          - `type` (enum) — required
            Values: `delimited_payload`
          - `version` (string) — optional
          - `delimiter` (string) — optional
            Character used to separate tokens from payloads. Defaults to `|`.
          - `encoding` (enum) — optional
            Data type for the stored payload.
            Values: `int`, `float`, `identity`
        - **type: dutch_stem** (`type: dutch_stem`)
          - `type` (enum) — required
            Values: `dutch_stem`
          - `version` (string) — optional
        - **type: edge_ngram** (`type: edge_ngram`)
          - `type` (enum) — required
            Values: `edge_ngram`
          - `version` (string) — optional
          - `max_gram` (number) — optional
            Maximum character length of a gram. For custom token filters, defaults to `2`. For the built-in edge_ngram filter, defaults to `1`.
          - `min_gram` (number) — optional
            Minimum character length of a gram. Defaults to `1`.
          - `side` (enum) — optional
            Indicates whether to truncate tokens from the `front` or `back`. Defaults to `front`.
            Values: `front`, `back`
          - `preserve_original` (boolean | string) — optional
            Emits original token when set to `true`. Defaults to `false`.
        - **type: elision** (`type: elision`)
          - `type` (enum) — required
            Values: `elision`
          - `version` (string) — optional
          - `articles` (string[]) — optional
            List of elisions to remove.
To be removed, the elision must be at the beginning of a token and be immediately followed by an apostrophe. Both the elision and apostrophe are removed.
For custom `elision` filters, either this parameter or `articles_path` must be specified.
          - `articles_path` (string) — optional
            Path to a file that contains a list of elisions to remove.
This path must be absolute or relative to the `config` location, and the file must be UTF-8 encoded. Each elision in the file must be separated by a line break.
To be removed, the elision must be at the beginning of a token and be immediately followed by an apostrophe. Both the elision and apostrophe are removed.
For custom `elision` filters, either this parameter or `articles` must be specified.
          - `articles_case` (boolean | string) — optional
            If `true`, elision matching is case insensitive. If `false`, elision matching is case sensitive. Defaults to `false`.
        - **type: fingerprint** (`type: fingerprint`)
          - `type` (enum) — required
            Values: `fingerprint`
          - `version` (string) — optional
          - `max_output_size` (number) — optional
            Maximum character length, including whitespace, of the output token. Defaults to `255`. Concatenated tokens longer than this will result in no token output.
          - `separator` (string) — optional
            Character to use to concatenate the token stream input. Defaults to a space.
        - **type: flatten_graph** (`type: flatten_graph`)
          - `type` (enum) — required
            Values: `flatten_graph`
          - `version` (string) — optional
        - **type: french_stem** (`type: french_stem`)
          - `type` (enum) — required
            Values: `french_stem`
          - `version` (string) — optional
        - **type: german_normalization** (`type: german_normalization`)
          - `type` (enum) — required
            Values: `german_normalization`
          - `version` (string) — optional
        - **type: german_stem** (`type: german_stem`)
          - `type` (enum) — required
            Values: `german_stem`
          - `version` (string) — optional
        - **type: hindi_normalization** (`type: hindi_normalization`)
          - `type` (enum) — required
            Values: `hindi_normalization`
          - `version` (string) — optional
        - **type: hunspell** (`type: hunspell`)
          - `type` (enum) — required
            Values: `hunspell`
          - `version` (string) — optional
          - `dedup` (boolean) — optional
            If `true`, duplicate tokens are removed from the filter’s output. Defaults to `true`.
          - `dictionary` (string) — optional
            One or more `.dic` files (e.g, `en_US.dic`, my_custom.dic) to use for the Hunspell dictionary.
By default, the `hunspell` filter uses all `.dic` files in the `<$ES_PATH_CONF>/hunspell/<locale>` directory specified using the `lang`, `language`, or `locale` parameter.
          - `locale` (string) — required
            Locale directory used to specify the `.aff` and `.dic` files for a Hunspell dictionary.
          - `longest_only` (boolean) — optional
            If `true`, only the longest stemmed version of each token is included in the output. If `false`, all stemmed versions of the token are included. Defaults to `false`.
        - **type: hyphenation_decompounder** (`type: hyphenation_decompounder`)
          - `type` (enum) — required
            Values: `hyphenation_decompounder`
          - `version` (string) — optional
          - `max_subword_size` (number) — optional
            Maximum subword character length. Longer subword tokens are excluded from the output. Defaults to `15`.
          - `min_subword_size` (number) — optional
            Minimum subword character length. Shorter subword tokens are excluded from the output. Defaults to `2`.
          - `min_word_size` (number) — optional
            Minimum word character length. Shorter word tokens are excluded from the output. Defaults to `5`.
          - `only_longest_match` (boolean) — optional
            If `true`, only include the longest matching subword. Defaults to `false`.
          - `word_list` (string[]) — optional
            A list of subwords to look for in the token stream. If found, the subword is included in the token output.
Either this parameter or `word_list_path` must be specified.
          - `word_list_path` (string) — optional
            Path to a file that contains a list of subwords to find in the token stream. If found, the subword is included in the token output.
This path must be absolute or relative to the config location, and the file must be UTF-8 encoded. Each token in the file must be separated by a line break.
Either this parameter or `word_list` must be specified.
          - `hyphenation_patterns_path` (string) — required
            Path to an Apache FOP (Formatting Objects Processor) XML hyphenation pattern file.
This path must be absolute or relative to the `config` location. Only FOP v1.2 compatible files are supported.
          - `no_sub_matches` (boolean) — optional
            If `true`, do not match sub tokens in tokens that are in the word list. Defaults to `false`.
          - `no_overlapping_matches` (boolean) — optional
            If `true`, do not allow overlapping tokens. Defaults to `false`.
        - **type: indic_normalization** (`type: indic_normalization`)
          - `type` (enum) — required
            Values: `indic_normalization`
          - `version` (string) — optional
        - **type: keep_types** (`type: keep_types`)
          - `type` (enum) — required
            Values: `keep_types`
          - `version` (string) — optional
          - `mode` (enum) — optional
            Indicates whether to keep or remove the specified token types.
            Values: `include`, `exclude`
          - `types` (string[]) — required
            List of token types to keep or remove.
        - **type: keep** (`type: keep`)
          - `type` (enum) — required
            Values: `keep`
          - `version` (string) — optional
          - `keep_words` (string[]) — optional
            List of words to keep. Only tokens that match words in this list are included in the output.
Either this parameter or `keep_words_path` must be specified.
          - `keep_words_case` (boolean) — optional
            If `true`, lowercase all keep words. Defaults to `false`.
          - `keep_words_path` (string) — optional
            Path to a file that contains a list of words to keep. Only tokens that match words in this list are included in the output.
This path must be absolute or relative to the `config` location, and the file must be UTF-8 encoded. Each word in the file must be separated by a line break.
Either this parameter or `keep_words` must be specified.
        - **type: keyword_marker** (`type: keyword_marker`)
          - `type` (enum) — required
            Values: `keyword_marker`
          - `version` (string) — optional
          - `ignore_case` (boolean) — optional
            If `true`, matching for the `keywords` and `keywords_path` parameters ignores letter case. Defaults to `false`.
          - `keywords` (union string | string[]) — optional
            Array of keywords. Tokens that match these keywords are not stemmed.
This parameter, `keywords_path`, or `keywords_pattern` must be specified. You cannot specify this parameter and `keywords_pattern`.
          - `keywords_path` (string) — optional
            Path to a file that contains a list of keywords. Tokens that match these keywords are not stemmed.
This path must be absolute or relative to the `config` location, and the file must be UTF-8 encoded. Each word in the file must be separated by a line break.
This parameter, `keywords`, or `keywords_pattern` must be specified. You cannot specify this parameter and `keywords_pattern`.
          - `keywords_pattern` (string) — optional
            Java regular expression used to match tokens. Tokens that match this expression are marked as keywords and not stemmed.
This parameter, `keywords`, or `keywords_path` must be specified. You cannot specify this parameter and `keywords` or `keywords_pattern`.
        - **type: keyword_repeat** (`type: keyword_repeat`)
          - `type` (enum) — required
            Values: `keyword_repeat`
          - `version` (string) — optional
        - **type: kstem** (`type: kstem`)
          - `type` (enum) — required
            Values: `kstem`
          - `version` (string) — optional
        - **type: length** (`type: length`)
          - `type` (enum) — required
            Values: `length`
          - `version` (string) — optional
          - `max` (number) — optional
            Maximum character length of a token. Longer tokens are excluded from the output. Defaults to `Integer.MAX_VALUE`, which is `2^31-1` or `2147483647`.
          - `min` (number) — optional
            Minimum character length of a token. Shorter tokens are excluded from the output. Defaults to `0`.
        - **type: limit** (`type: limit`)
          - `type` (enum) — required
            Values: `limit`
          - `version` (string) — optional
          - `consume_all_tokens` (boolean) — optional
            If `true`, the limit filter exhausts the token stream, even if the `max_token_count` has already been reached. Defaults to `false`.
          - `max_token_count` (number | string) — optional
            Maximum number of tokens to keep. Once this limit is reached, any remaining tokens are excluded from the output. Defaults to `1`.
        - **type: lowercase** (`type: lowercase`)
          - `type` (enum) — required
            Values: `lowercase`
          - `version` (string) — optional
          - `language` (enum) — optional
            Language-specific lowercase token filter to use.
            Values: `greek`, `irish`, `turkish`
        - **type: min_hash** (`type: min_hash`)
          - `type` (enum) — required
            Values: `min_hash`
          - `version` (string) — optional
          - `bucket_count` (number) — optional
            Number of buckets to which hashes are assigned. Defaults to `512`.
          - `hash_count` (number) — optional
            Number of ways to hash each token in the stream. Defaults to `1`.
          - `hash_set_size` (number) — optional
            Number of hashes to keep from each bucket. Defaults to `1`.
Hashes are retained by ascending size, starting with the bucket’s smallest hash first.
          - `with_rotation` (boolean) — optional
            If `true`, the filter fills empty buckets with the value of the first non-empty bucket to its circular right if the `hash_set_size` is `1`. If the `bucket_count` argument is greater than 1, this parameter defaults to `true`. Otherwise, this parameter defaults to `false`.
        - **type: multiplexer** (`type: multiplexer`)
          - `type` (enum) — required
            Values: `multiplexer`
          - `version` (string) — optional
          - `filters` (string[]) — required
            A list of token filters to apply to incoming tokens.
          - `preserve_original` (boolean | string) — optional
            If `true` (the default) then emit the original token in addition to the filtered tokens.
        - **type: ngram** (`type: ngram`)
          - `type` (enum) — required
            Values: `ngram`
          - `version` (string) — optional
          - `max_gram` (number) — optional
            Maximum length of characters in a gram. Defaults to `2`.
          - `min_gram` (number) — optional
            Minimum length of characters in a gram. Defaults to `1`.
          - `preserve_original` (boolean | string) — optional
            Emits original token when set to `true`. Defaults to `false`.
        - **type: nori_part_of_speech** (`type: nori_part_of_speech`)
          - `type` (enum) — required
            Values: `nori_part_of_speech`
          - `version` (string) — optional
          - `stoptags` (string[]) — optional
            An array of part-of-speech tags that should be removed.
        - **type: pattern_capture** (`type: pattern_capture`)
          - `type` (enum) — required
            Values: `pattern_capture`
          - `version` (string) — optional
          - `patterns` (string[]) — required
            A list of regular expressions to match.
          - `preserve_original` (boolean | string) — optional
            If set to `true` (the default) it will emit the original token.
        - **type: pattern_replace** (`type: pattern_replace`)
          - `type` (enum) — required
            Values: `pattern_replace`
          - `version` (string) — optional
          - `all` (boolean) — optional
            If `true`, all substrings matching the pattern parameter’s regular expression are replaced. If `false`, the filter replaces only the first matching substring in each token. Defaults to `true`.
          - `flags` (string) — optional
          - `pattern` (string) — required
            Regular expression, written in Java’s regular expression syntax. The filter replaces token substrings matching this pattern with the substring in the `replacement` parameter.
          - `replacement` (string) — optional
            Replacement substring. Defaults to an empty substring (`""`).
        - **type: persian_normalization** (`type: persian_normalization`)
          - `type` (enum) — required
            Values: `persian_normalization`
          - `version` (string) — optional
        - **type: persian_stem** (`type: persian_stem`)
          - `type` (enum) — required
            Values: `persian_stem`
          - `version` (string) — optional
        - **type: porter_stem** (`type: porter_stem`)
          - `type` (enum) — required
            Values: `porter_stem`
          - `version` (string) — optional
        - **type: predicate_token_filter** (`type: predicate_token_filter`)
          - `type` (enum) — required
            Values: `predicate_token_filter`
          - `version` (string) — optional
          - `script` (string) — required
            Script containing a condition used to filter incoming tokens. Only tokens that match this script are included in the output.
        - **type: remove_duplicates** (`type: remove_duplicates`)
          - `type` (enum) — required
            Values: `remove_duplicates`
          - `version` (string) — optional
        - **type: reverse** (`type: reverse`)
          - `type` (enum) — required
            Values: `reverse`
          - `version` (string) — optional
        - **type: russian_stem** (`type: russian_stem`)
          - `type` (enum) — required
            Values: `russian_stem`
          - `version` (string) — optional
        - **type: scandinavian_folding** (`type: scandinavian_folding`)
          - `type` (enum) — required
            Values: `scandinavian_folding`
          - `version` (string) — optional
        - **type: scandinavian_normalization** (`type: scandinavian_normalization`)
          - `type` (enum) — required
            Values: `scandinavian_normalization`
          - `version` (string) — optional
        - **type: serbian_normalization** (`type: serbian_normalization`)
          - `type` (enum) — required
            Values: `serbian_normalization`
          - `version` (string) — optional
        - **type: shingle** (`type: shingle`)
          - `type` (enum) — required
            Values: `shingle`
          - `version` (string) — optional
          - `filler_token` (string) — optional
            String used in shingles as a replacement for empty positions that do not contain a token. This filler token is only used in shingles, not original unigrams. Defaults to an underscore (`_`).
          - `max_shingle_size` (number | string) — optional
            Maximum number of tokens to concatenate when creating shingles. Defaults to `2`.
          - `min_shingle_size` (number | string) — optional
            Minimum number of tokens to concatenate when creating shingles. Defaults to `2`.
          - `output_unigrams` (boolean) — optional
            If `true`, the output includes the original input tokens. If `false`, the output only includes shingles; the original input tokens are removed. Defaults to `true`.
          - `output_unigrams_if_no_shingles` (boolean) — optional
            If `true`, the output includes the original input tokens only if no shingles are produced; if shingles are produced, the output only includes shingles. Defaults to `false`.
          - `token_separator` (string) — optional
            Separator used to concatenate adjacent tokens to form a shingle. Defaults to a space (`" "`).
        - **type: snowball** (`type: snowball`)
          - `type` (enum) — required
            Values: `snowball`
          - `version` (string) — optional
          - `language` (enum) — optional
            Controls the language used by the stemmer.
            Values: `Arabic`, `Armenian`, `Basque`, `Catalan`, `Danish`, `Dutch`, `English`, `Estonian`, `Finnish`, `French`, `German`, `German2`, `Hungarian`, `Italian`, `Irish`, `Kp`, `Lithuanian`, `Lovins`, `Norwegian`, `Porter`, `Portuguese`, `Romanian`, `Russian`, `Serbian`, `Spanish`, `Swedish`, `Turkish`
        - **type: sorani_normalization** (`type: sorani_normalization`)
          - `type` (enum) — required
            Values: `sorani_normalization`
          - `version` (string) — optional
        - **type: stemmer_override** (`type: stemmer_override`)
          - `type` (enum) — required
            Values: `stemmer_override`
          - `version` (string) — optional
          - `rules` (string[]) — optional
            A list of mapping rules to use.
          - `rules_path` (string) — optional
            A path (either relative to `config` location, or absolute) to a list of mappings.
        - **type: stemmer** (`type: stemmer`)
          - `type` (enum) — required
            Values: `stemmer`
          - `version` (string) — optional
          - `language` (string) — optional
        - **type: stop** (`type: stop`)
          - `type` (enum) — required
            Values: `stop`
          - `version` (string) — optional
          - `ignore_case` (boolean) — optional
            If `true`, stop word matching is case insensitive. For example, if `true`, a stop word of the matches and removes `The`, `THE`, or `the`. Defaults to `false`.
          - `remove_trailing` (boolean) — optional
            If `true`, the last token of a stream is removed if it’s a stop word. Defaults to `true`.
          - `stopwords` (union oneOf) — optional
            Language value, such as `_arabic_` or `_thai_`. Defaults to `_english_`.
            Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
          - `stopwords_path` (string) — optional
            Path to a file that contains a list of stop words to remove.
This path must be absolute or relative to the `config` location, and the file must be UTF-8 encoded. Each stop word in the file must be separated by a line break.
        - **type: synonym_graph** (`type: synonym_graph`)
          - `type` (enum) — required
            Values: `synonym_graph`
          - `version` (string) — optional
          - `expand` (boolean) — optional
            Expands definitions for equivalent synonym rules. Defaults to `true`.
          - `format` (enum) — optional
            Sets the synonym rules format.
            Values: `solr`, `wordnet`
          - `lenient` (boolean) — optional
            If `true` ignores errors while parsing the synonym rules. It is important to note that only those synonym rules which cannot get parsed are ignored. Defaults to the value of the `updateable` setting.
          - `synonyms` (string[]) — optional
            Used to define inline synonyms.
          - `synonyms_path` (string) — optional
            Used to provide a synonym file. This path must be absolute or relative to the `config` location.
          - `synonyms_set` (string) — optional
            Provide a synonym set created via Synonyms Management APIs.
          - `tokenizer` (string) — optional — deprecated
            Controls the tokenizers that will be used to tokenize the synonym, this parameter is for backwards compatibility for indices that created before 6.0.
          - `updateable` (boolean) — optional
            If `true` allows reloading search analyzers to pick up changes to synonym files. Only to be used for search analyzers. Defaults to `false`.
        - **type: synonym** (`type: synonym`)
          - `type` (enum) — required
            Values: `synonym`
          - `version` (string) — optional
          - `expand` (boolean) — optional
            Expands definitions for equivalent synonym rules. Defaults to `true`.
          - `format` (enum) — optional
            Sets the synonym rules format.
            Values: `solr`, `wordnet`
          - `lenient` (boolean) — optional
            If `true` ignores errors while parsing the synonym rules. It is important to note that only those synonym rules which cannot get parsed are ignored. Defaults to the value of the `updateable` setting.
          - `synonyms` (string[]) — optional
            Used to define inline synonyms.
          - `synonyms_path` (string) — optional
            Used to provide a synonym file. This path must be absolute or relative to the `config` location.
          - `synonyms_set` (string) — optional
            Provide a synonym set created via Synonyms Management APIs.
          - `tokenizer` (string) — optional — deprecated
            Controls the tokenizers that will be used to tokenize the synonym, this parameter is for backwards compatibility for indices that created before 6.0.
          - `updateable` (boolean) — optional
            If `true` allows reloading search analyzers to pick up changes to synonym files. Only to be used for search analyzers. Defaults to `false`.
        - **type: trim** (`type: trim`)
          - `type` (enum) — required
            Values: `trim`
          - `version` (string) — optional
        - **type: truncate** (`type: truncate`)
          - `type` (enum) — required
            Values: `truncate`
          - `version` (string) — optional
          - `length` (number) — optional
            Character limit for each token. Tokens exceeding this limit are truncated. Defaults to `10`.
        - **type: unique** (`type: unique`)
          - `type` (enum) — required
            Values: `unique`
          - `version` (string) — optional
          - `only_on_same_position` (boolean) — optional
            If `true`, only remove duplicate tokens in the same position. Defaults to `false`.
        - **type: uppercase** (`type: uppercase`)
          - `type` (enum) — required
            Values: `uppercase`
          - `version` (string) — optional
        - **type: word_delimiter_graph** (`type: word_delimiter_graph`)
          - `type` (enum) — required
            Values: `word_delimiter_graph`
          - `version` (string) — optional
          - `catenate_all` (boolean) — optional
            If `true`, the filter produces catenated tokens for chains of alphanumeric characters separated by non-alphabetic delimiters. Defaults to `false`.
          - `catenate_numbers` (boolean) — optional
            If `true`, the filter produces catenated tokens for chains of numeric characters separated by non-alphabetic delimiters. Defaults to `false`.
          - `catenate_words` (boolean) — optional
            If `true`, the filter produces catenated tokens for chains of alphabetical characters separated by non-alphabetic delimiters. Defaults to `false`.
          - `generate_number_parts` (boolean) — optional
            If `true`, the filter includes tokens consisting of only numeric characters in the output. If `false`, the filter excludes these tokens from the output. Defaults to `true`.
          - `generate_word_parts` (boolean) — optional
            If `true`, the filter includes tokens consisting of only alphabetical characters in the output. If `false`, the filter excludes these tokens from the output. Defaults to `true`.
          - `preserve_original` (boolean | string) — optional
            If `true`, the filter includes the original version of any split tokens in the output. This original version includes non-alphanumeric delimiters. Defaults to `false`.
          - `protected_words` (string[]) — optional
            Array of tokens the filter won’t split.
          - `protected_words_path` (string) — optional
            Path to a file that contains a list of tokens the filter won’t split.
This path must be absolute or relative to the `config` location, and the file must be UTF-8 encoded. Each token in the file must be separated by a line break.
          - `split_on_case_change` (boolean) — optional
            If `true`, the filter splits tokens at letter case transitions. For example: camelCase -> [ camel, Case ]. Defaults to `true`.
          - `split_on_numerics` (boolean) — optional
            If `true`, the filter splits tokens at letter-number transitions. For example: j2se -> [ j, 2, se ]. Defaults to `true`.
          - `stem_english_possessive` (boolean) — optional
            If `true`, the filter removes the English possessive (`'s`) from the end of each token. For example: O'Neil's -> [ O, Neil ]. Defaults to `true`.
          - `type_table` (string[]) — optional
            Array of custom type mappings for characters. This allows you to map non-alphanumeric characters as numeric or alphanumeric to avoid splitting on those characters.
          - `type_table_path` (string) — optional
            Path to a file that contains custom type mappings for characters. This allows you to map non-alphanumeric characters as numeric or alphanumeric to avoid splitting on those characters.
          - `adjust_offsets` (boolean) — optional
            If `true`, the filter adjusts the offsets of split or catenated tokens to better reflect their actual position in the token stream. Defaults to `true`.
          - `ignore_keywords` (boolean) — optional
            If `true`, the filter skips tokens with a keyword attribute of true. Defaults to `false`.
        - **type: word_delimiter** (`type: word_delimiter`)
          - `type` (enum) — required
            Values: `word_delimiter`
          - `version` (string) — optional
          - `catenate_all` (boolean) — optional
            If `true`, the filter produces catenated tokens for chains of alphanumeric characters separated by non-alphabetic delimiters. Defaults to `false`.
          - `catenate_numbers` (boolean) — optional
            If `true`, the filter produces catenated tokens for chains of numeric characters separated by non-alphabetic delimiters. Defaults to `false`.
          - `catenate_words` (boolean) — optional
            If `true`, the filter produces catenated tokens for chains of alphabetical characters separated by non-alphabetic delimiters. Defaults to `false`.
          - `generate_number_parts` (boolean) — optional
            If `true`, the filter includes tokens consisting of only numeric characters in the output. If `false`, the filter excludes these tokens from the output. Defaults to `true`.
          - `generate_word_parts` (boolean) — optional
            If `true`, the filter includes tokens consisting of only alphabetical characters in the output. If `false`, the filter excludes these tokens from the output. Defaults to `true`.
          - `preserve_original` (boolean | string) — optional
            If `true`, the filter includes the original version of any split tokens in the output. This original version includes non-alphanumeric delimiters. Defaults to `false`.
          - `protected_words` (string[]) — optional
            Array of tokens the filter won’t split.
          - `protected_words_path` (string) — optional
            Path to a file that contains a list of tokens the filter won’t split.
This path must be absolute or relative to the `config` location, and the file must be UTF-8 encoded. Each token in the file must be separated by a line break.
          - `split_on_case_change` (boolean) — optional
            If `true`, the filter splits tokens at letter case transitions. For example: camelCase -> [ camel, Case ]. Defaults to `true`.
          - `split_on_numerics` (boolean) — optional
            If `true`, the filter splits tokens at letter-number transitions. For example: j2se -> [ j, 2, se ]. Defaults to `true`.
          - `stem_english_possessive` (boolean) — optional
            If `true`, the filter removes the English possessive (`'s`) from the end of each token. For example: O'Neil's -> [ O, Neil ]. Defaults to `true`.
          - `type_table` (string[]) — optional
            Array of custom type mappings for characters. This allows you to map non-alphanumeric characters as numeric or alphanumeric to avoid splitting on those characters.
          - `type_table_path` (string) — optional
            Path to a file that contains custom type mappings for characters. This allows you to map non-alphanumeric characters as numeric or alphanumeric to avoid splitting on those characters.
        - **type: ja_stop** (`type: ja_stop`)
          - `type` (enum) — required
            Values: `ja_stop`
          - `version` (string) — optional
          - `stopwords` (union oneOf) — optional
            Values: `_arabic_`, `_armenian_`, `_basque_`, `_bengali_`, `_brazilian_`, `_bulgarian_`, `_catalan_`, `_cjk_`, `_czech_`, `_danish_`, `_dutch_`, `_english_`, `_estonian_`, `_finnish_`, `_french_`, `_galician_`, `_german_`, `_greek_`, `_hindi_`, `_hungarian_`, `_indonesian_`, `_irish_`, `_italian_`, `_latvian_`, `_lithuanian_`, `_norwegian_`, `_persian_`, `_portuguese_`, `_romanian_`, `_russian_`, `_serbian_`, `_sorani_`, `_spanish_`, `_swedish_`, `_thai_`, `_turkish_`, `_none_`
        - **type: kuromoji_stemmer** (`type: kuromoji_stemmer`)
          - `type` (enum) — required
            Values: `kuromoji_stemmer`
          - `version` (string) — optional
          - `minimum_length` (number) — required
        - **type: kuromoji_readingform** (`type: kuromoji_readingform`)
          - `type` (enum) — required
            Values: `kuromoji_readingform`
          - `version` (string) — optional
          - `use_romaji` (boolean) — required
        - **type: kuromoji_part_of_speech** (`type: kuromoji_part_of_speech`)
          - `type` (enum) — required
            Values: `kuromoji_part_of_speech`
          - `version` (string) — optional
          - `stoptags` (string[]) — required
        - **type: icu_collation** (`type: icu_collation`)
          - `type` (enum) — required
            Values: `icu_collation`
          - `version` (string) — optional
          - `alternate` (enum) — optional
            Values: `shifted`, `non-ignorable`
          - `caseFirst` (enum) — optional
            Values: `lower`, `upper`
          - `caseLevel` (boolean) — optional
          - `country` (string) — optional
          - `decomposition` (enum) — optional
            Values: `no`, `identical`
          - `hiraganaQuaternaryMode` (boolean) — optional
          - `language` (string) — optional
          - `numeric` (boolean) — optional
          - `rules` (string) — optional
          - `strength` (enum) — optional
            Values: `primary`, `secondary`, `tertiary`, `quaternary`, `identical`
          - `variableTop` (string) — optional
          - `variant` (string) — optional
        - **type: icu_folding** (`type: icu_folding`)
          - `type` (enum) — required
            Values: `icu_folding`
          - `version` (string) — optional
          - `unicode_set_filter` (string) — required
        - **type: icu_normalizer** (`type: icu_normalizer`)
          - `type` (enum) — required
            Values: `icu_normalizer`
          - `version` (string) — optional
          - `name` (enum) — required
            Values: `nfc`, `nfkc`, `nfkc_cf`
        - **type: icu_transform** (`type: icu_transform`)
          - `type` (enum) — required
            Values: `icu_transform`
          - `version` (string) — optional
          - `dir` (enum) — optional
            Values: `forward`, `reverse`
          - `id` (string) — required
        - **type: phonetic** (`type: phonetic`)
          - `type` (enum) — required
            Values: `phonetic`
          - `version` (string) — optional
          - `encoder` (enum) — required
            Values: `metaphone`, `double_metaphone`, `soundex`, `refined_soundex`, `caverphone1`, `caverphone2`, `cologne`, `nysiis`, `koelnerphonetik`, `haasephonetik`, `beider_morse`, `daitch_mokotoff`
          - `languageset` (union enum | enum[]) — optional
            

Supported values include: `any`, `common`, `cyrillic`, `english`, `french`, `german`, `hebrew`, `hungarian`, `polish`, `romanian`, `russian`, `spanish`
            Values: `any`, `common`, `cyrillic`, `english`, `french`, `german`, `hebrew`, `hungarian`, `polish`, `romanian`, `russian`, `spanish`
          - `max_code_len` (number) — optional
          - `name_type` (enum) — optional
            Values: `generic`, `ashkenazi`, `sephardic`
          - `replace` (boolean) — optional
          - `rule_type` (enum) — optional
            Values: `approx`, `exact`
        - **type: dictionary_decompounder** (`type: dictionary_decompounder`)
          - `type` (enum) — required
            Values: `dictionary_decompounder`
          - `version` (string) — optional
          - `max_subword_size` (number) — optional
            Maximum subword character length. Longer subword tokens are excluded from the output. Defaults to `15`.
          - `min_subword_size` (number) — optional
            Minimum subword character length. Shorter subword tokens are excluded from the output. Defaults to `2`.
          - `min_word_size` (number) — optional
            Minimum word character length. Shorter word tokens are excluded from the output. Defaults to `5`.
          - `only_longest_match` (boolean) — optional
            If `true`, only include the longest matching subword. Defaults to `false`.
          - `word_list` (string[]) — optional
            A list of subwords to look for in the token stream. If found, the subword is included in the token output.
Either this parameter or `word_list_path` must be specified.
          - `word_list_path` (string) — optional
            Path to a file that contains a list of subwords to find in the token stream. If found, the subword is included in the token output.
This path must be absolute or relative to the config location, and the file must be UTF-8 encoded. Each token in the file must be separated by a line break.
Either this parameter or `word_list` must be specified.
    - `normalizer` (map string to oneOf) — optional
      Map values (union oneOf)
      One of:
      - **type: lowercase** (`type: lowercase`)
        - `type` (enum) — required
          Values: `lowercase`
      - **type: custom** (`type: custom`)
        - `type` (enum) — required
          Values: `custom`
        - `char_filter` (string[]) — optional
        - `filter` (string[]) — optional
    - `tokenizer` (map string to oneOf) — optional
      Map values (union oneOf)
      One of:
      - **string**
      - **TokenizerDefinition**
        One of:
        - **type: char_group** (`type: char_group`)
          - `type` (enum) — required
            Values: `char_group`
          - `version` (string) — optional
          - `tokenize_on_chars` (string[]) — required
          - `max_token_length` (number) — optional
        - **type: classic** (`type: classic`)
          - `type` (enum) — required
            Values: `classic`
          - `version` (string) — optional
          - `max_token_length` (number) — optional
        - **type: edge_ngram** (`type: edge_ngram`)
          - `type` (enum) — required
            Values: `edge_ngram`
          - `version` (string) — optional
          - `custom_token_chars` (string) — optional
          - `max_gram` (number) — optional
          - `min_gram` (number) — optional
          - `token_chars` (enum[] · default: []) — optional
            Values: `letter`, `digit`, `whitespace`, `punctuation`, `symbol`, `custom`
        - **type: keyword** (`type: keyword`)
          - `type` (enum) — required
            Values: `keyword`
          - `version` (string) — optional
          - `buffer_size` (number · default: 256) — optional
        - **type: letter** (`type: letter`)
          - `type` (enum) — required
            Values: `letter`
          - `version` (string) — optional
        - **type: lowercase** (`type: lowercase`)
          - `type` (enum) — required
            Values: `lowercase`
          - `version` (string) — optional
        - **type: ngram** (`type: ngram`)
          - `type` (enum) — required
            Values: `ngram`
          - `version` (string) — optional
          - `custom_token_chars` (string) — optional
          - `max_gram` (number) — optional
          - `min_gram` (number) — optional
          - `token_chars` (enum[] · default: []) — optional
            Values: `letter`, `digit`, `whitespace`, `punctuation`, `symbol`, `custom`
        - **type: path_hierarchy** (`type: path_hierarchy`)
          - `type` (enum) — required
            Values: `path_hierarchy`
          - `version` (string) — optional
          - `buffer_size` (number | string) — optional
          - `delimiter` (string) — optional
          - `replacement` (string) — optional
          - `reverse` (boolean | string) — optional
          - `skip` (number | string) — optional
        - **type: pattern** (`type: pattern`)
          - `type` (enum) — required
            Values: `pattern`
          - `version` (string) — optional
          - `flags` (string) — optional
          - `group` (number) — optional
          - `pattern` (string) — optional
        - **type: simple_pattern** (`type: simple_pattern`)
          - `type` (enum) — required
            Values: `simple_pattern`
          - `version` (string) — optional
          - `pattern` (string) — optional
        - **type: simple_pattern_split** (`type: simple_pattern_split`)
          - `type` (enum) — required
            Values: `simple_pattern_split`
          - `version` (string) — optional
          - `pattern` (string) — optional
        - **type: standard** (`type: standard`)
          - `type` (enum) — required
            Values: `standard`
          - `version` (string) — optional
          - `max_token_length` (number) — optional
        - **type: thai** (`type: thai`)
          - `type` (enum) — required
            Values: `thai`
          - `version` (string) — optional
        - **type: uax_url_email** (`type: uax_url_email`)
          - `type` (enum) — required
            Values: `uax_url_email`
          - `version` (string) — optional
          - `max_token_length` (number) — optional
        - **type: whitespace** (`type: whitespace`)
          - `type` (enum) — required
            Values: `whitespace`
          - `version` (string) — optional
          - `max_token_length` (number) — optional
        - **type: icu_tokenizer** (`type: icu_tokenizer`)
          - `type` (enum) — required
            Values: `icu_tokenizer`
          - `version` (string) — optional
          - `rule_files` (string) — required
        - **type: kuromoji_tokenizer** (`type: kuromoji_tokenizer`)
          - `type` (enum) — required
            Values: `kuromoji_tokenizer`
          - `version` (string) — optional
          - `discard_punctuation` (boolean) — optional
          - `mode` (enum) — required
            Values: `normal`, `search`, `extended`
          - `nbest_cost` (number) — optional
          - `nbest_examples` (string) — optional
          - `user_dictionary` (string) — optional
          - `user_dictionary_rules` (string[]) — optional
          - `discard_compound_token` (boolean) — optional
        - **type: nori_tokenizer** (`type: nori_tokenizer`)
          - `type` (enum) — required
            Values: `nori_tokenizer`
          - `version` (string) — optional
          - `decompound_mode` (enum) — optional
            Values: `discard`, `none`, `mixed`
          - `discard_punctuation` (boolean) — optional
          - `user_dictionary` (string) — optional
          - `user_dictionary_rules` (string[]) — optional
  - `settings` (object) — optional — recursive
    Same fields as `settings`
  - `time_series` (object) — optional
    - `end_time` (union oneOf) — optional
      One of: `string` or `number`
    - `start_time` (union oneOf) — optional
      One of: `string` or `number`
  - `queries` (object) — optional
    - `cache` (object) — optional
      - `enabled` (boolean) — required
  - `requests` (object) — optional
    - `cache` (object) — optional
      - `enable` (boolean | string · default: true) — optional
        Whether the shard request cache is enabled for the index.
This setting is dynamic and can be updated on an existing index.
  - `similarity` (map string to oneOf) — optional
    Configure custom similarity settings to customize how search results are scored.
    Map values (union oneOf)
    One of:
    - **type: BM25** (`type: BM25`)
      - `type` (enum) — required
        Values: `BM25`
      - `b` (number) — optional
      - `discount_overlaps` (boolean) — optional
      - `k1` (number) — optional
    - **type: boolean** (`type: boolean`)
      - `type` (enum) — required
        Values: `boolean`
    - **type: DFI** (`type: DFI`)
      - `type` (enum) — required
        Values: `DFI`
      - `independence_measure` (enum) — required
        Values: `standardized`, `saturated`, `chisquared`
    - **type: DFR** (`type: DFR`)
      - `type` (enum) — required
        Values: `DFR`
      - `after_effect` (enum) — required
        Values: `no`, `b`, `l`
      - `basic_model` (enum) — required
        Values: `be`, `d`, `g`, `if`, `in`, `ine`, `p`
      - `normalization` (enum) — required
        Values: `no`, `h1`, `h2`, `h3`, `z`
    - **type: IB** (`type: IB`)
      - `type` (enum) — required
        Values: `IB`
      - `distribution` (enum) — required
        Values: `ll`, `spl`
      - `lambda` (enum) — required
        Values: `df`, `ttf`
      - `normalization` (enum) — required
        Values: `no`, `h1`, `h2`, `h3`, `z`
    - **type: LMDirichlet** (`type: LMDirichlet`)
      - `type` (enum) — required
        Values: `LMDirichlet`
      - `mu` (number) — optional
    - **type: LMJelinekMercer** (`type: LMJelinekMercer`)
      - `type` (enum) — required
        Values: `LMJelinekMercer`
      - `lambda` (number) — optional
    - **type: scripted** (`type: scripted`)
      - `type` (enum) — required
        Values: `scripted`
      - `script` (string) — required
      - `weight_script` (string) — optional
  - `mapping` (object) — optional
    Enable or disable dynamic mapping for an index.
    - `coerce` (boolean) — optional
    - `total_fields` (object) — optional
      - `limit` (number | string · default: 1000) — optional
        The maximum number of fields in an index. Field and object mappings, as well as field aliases count towards this limit.
The limit is in place to prevent mappings and searches from becoming too large. Higher values can lead to performance
degradations and memory issues, especially in clusters with a high load or few resources.
      - `ignore_dynamic_beyond_limit` (boolean | string · default: false) — optional
        This setting determines what happens when a dynamically mapped field would exceed the total fields limit. When set
to false (the default), the index request of the document that tries to add a dynamic field to the mapping will fail
with the message Limit of total fields [X] has been exceeded. When set to true, the index request will not fail.
Instead, fields that would exceed the limit are not added to the mapping, similar to dynamic: false.
The fields that were not added to the mapping will be added to the _ignored field.
    - `depth` (object) — optional
      - `limit` (number · default: 20) — optional
        The maximum depth for a field, which is measured as the number of inner objects. For instance, if all fields are defined
at the root object level, then the depth is 1. If there is one object mapping, then the depth is 2, etc.
    - `nested_fields` (object) — optional
      - `limit` (number · default: 50) — optional
        The maximum number of distinct nested mappings in an index. The nested type should only be used in special cases, when
arrays of objects need to be queried independently of each other. To safeguard against poorly designed mappings, this
setting limits the number of unique nested types per index.
    - `nested_objects` (object) — optional
      - `limit` (number · default: 10000) — optional
        The maximum number of nested JSON objects that a single document can contain across all nested types. This limit helps
to prevent out of memory errors when a document contains too many nested objects.
    - `field_name_length` (object) — optional
      - `limit` (number) — optional
        Setting for the maximum length of a field name. This setting isn’t really something that addresses mappings explosion but
might still be useful if you want to limit the field length. It usually shouldn’t be necessary to set this setting. The
default is okay unless a user starts to add a huge number of fields with really long names. Default is `Long.MAX_VALUE` (no limit).
    - `dimension_fields` (object) — optional
      - `limit` (number) — optional
        [preview] This functionality is in technical preview and may be changed or removed in a future release.
Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.
    - `source` (object) — optional
      - `mode` (enum) — required
        Values: `disabled`, `stored`, `synthetic`
    - `ignore_malformed` (boolean | string) — optional
  - `indexing.slowlog` (object) — optional
    - `level` (string) — optional
    - `source` (number) — optional
    - `reformat` (boolean) — optional
    - `threshold` (object) — optional
      - `index` (object) — optional
        The indexing slow log, similar in functionality to the search slow log. The log file name ends with `_index_indexing_slowlog.json`.
Log and the thresholds are configured in the same way as the search slowlog.
        - `warn` (union oneOf) — optional
          Values: `-1`, `0`
        - `info` (union oneOf) — optional
          Values: `-1`, `0`
        - `debug` (union oneOf) — optional
          Values: `-1`, `0`
        - `trace` (union oneOf) — optional
          Values: `-1`, `0`
  - `indexing_pressure` (object) — optional
    Configure indexing back pressure limits.
    - `memory` (object) — required
      - `limit` (number) — optional
        Number of outstanding bytes that may be consumed by indexing requests. When this limit is reached or exceeded,
the node will reject new coordinating and primary operations. When replica operations consume 1.5x this limit,
the node will reject new replica operations. Defaults to 10% of the heap.
  - `store` (object) — optional
    The store module allows you to control how index data is stored and accessed on disk.
    - `type` (union anyOf) — optional
      

Supported values include:
  - `fs`: Default file system implementation. This will pick the best implementation depending on the operating environment, which
is currently hybridfs on all supported systems but is subject to change.
  - `niofs`: The NIO FS type stores the shard index on the file system (maps to Lucene NIOFSDirectory) using NIO. It allows multiple
threads to read from the same file concurrently. It is not recommended on Windows because of a bug in the SUN Java
implementation and disables some optimizations for heap memory usage.
  - `mmapfs`: The MMap FS type stores the shard index on the file system (maps to Lucene MMapDirectory) by mapping a file into
memory (mmap). Memory mapping uses up a portion of the virtual memory address space in your process equal to the size
of the file being mapped. Before using this class, be sure you have allowed plenty of virtual address space.
  - `hybridfs`: The hybridfs type is a hybrid of niofs and mmapfs, which chooses the best file system type for each type of file
based on the read access pattern. Currently only the Lucene term dictionary, norms and doc values files are memory
mapped. All other files are opened using Lucene NIOFSDirectory. Similarly to mmapfs be sure you have allowed
plenty of virtual address space.
      Values: `fs`, `niofs`, `mmapfs`, `hybridfs`
    - `allow_mmap` (boolean) — optional
      You can restrict the use of the mmapfs and the related hybridfs store type via the setting node.store.allow_mmap.
This is a boolean setting indicating whether or not memory-mapping is allowed. The default is to allow it. This
setting is useful, for example, if you are in an environment where you can not control the ability to create a lot
of memory maps so you need disable the ability to use memory-mapping.
    - `stats_refresh_interval` (union oneOf) — optional
      How often store statistics are refreshed
      Values: `-1`, `0`

## Response

`application/json`

- `follow_index_created` (boolean)
- `follow_index_shards_acked` (boolean)
- `index_following_started` (boolean)
## Code examples

#### Console

```console
PUT /follower_index/_ccr/follow?wait_for_active_shards=1
{
  "remote_cluster" : "remote_cluster",
  "leader_index" : "leader_index",
  "settings": {
    "index.number_of_replicas": 0
  },
  "max_read_request_operation_count" : 1024,
  "max_outstanding_read_requests" : 16,
  "max_read_request_size" : "1024k",
  "max_write_request_operation_count" : 32768,
  "max_write_request_size" : "16k",
  "max_outstanding_write_requests" : 8,
  "max_write_buffer_count" : 512,
  "max_write_buffer_size" : "512k",
  "max_retry_delay" : "10s",
  "read_poll_timeout" : "30s"
}
```

#### JavaScript

```javascript
const response = await client.ccr.follow({
  index: "follower_index",
  wait_for_active_shards: 1,
  remote_cluster: "remote_cluster",
  leader_index: "leader_index",
  settings: {
    "index.number_of_replicas": 0,
  },
  max_read_request_operation_count: 1024,
  max_outstanding_read_requests: 16,
  max_read_request_size: "1024k",
  max_write_request_operation_count: 32768,
  max_write_request_size: "16k",
  max_outstanding_write_requests: 8,
  max_write_buffer_count: 512,
  max_write_buffer_size: "512k",
  max_retry_delay: "10s",
  read_poll_timeout: "30s",
});
```

#### Python

```python
resp = client.ccr.follow(
    index="follower_index",
    wait_for_active_shards="1",
    remote_cluster="remote_cluster",
    leader_index="leader_index",
    settings={
        "index.number_of_replicas": 0
    },
    max_read_request_operation_count=1024,
    max_outstanding_read_requests=16,
    max_read_request_size="1024k",
    max_write_request_operation_count=32768,
    max_write_request_size="16k",
    max_outstanding_write_requests=8,
    max_write_buffer_count=512,
    max_write_buffer_size="512k",
    max_retry_delay="10s",
    read_poll_timeout="30s",
)
```

#### curl

```curl
curl -X PUT "$ELASTICSEARCH_URL/follower_index/_ccr/follow?wait_for_active_shards=1" \
  -H "Authorization: ApiKey $ELASTIC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "remote_cluster": "remote_cluster",
    "leader_index": "leader_index",
    "settings": {
      "index.number_of_replicas": 0
    },
    "max_read_request_operation_count": 1024,
    "max_outstanding_read_requests": 16,
    "max_read_request_size": "1024k",
    "max_write_request_operation_count": 32768,
    "max_write_request_size": "16k",
    "max_outstanding_write_requests": 8,
    "max_write_buffer_count": 512,
    "max_write_buffer_size": "512k",
    "max_retry_delay": "10s",
    "read_poll_timeout": "30s"
  }'
```

#### Java

```java
client.ccr().follow(f -> f
    .index("follower_index")
    .leaderIndex("leader_index")
    .maxOutstandingReadRequests(16L)
    .maxOutstandingWriteRequests(8)
    .maxReadRequestOperationCount(1024)
    .maxReadRequestSize("1024k")
    .maxRetryDelay(m -> m
        .time("10s")
    )
    .maxWriteBufferCount(512)
    .maxWriteBufferSize("512k")
    .maxWriteRequestOperationCount(32768)
    .maxWriteRequestSize("16k")
    .readPollTimeout(r -> r
        .time("30s")
    )
    .remoteCluster("remote_cluster")
    .settings(s -> s
        .otherSettings("index.number_of_replicas", JsonData.fromJson("0"))
    )
    .waitForActiveShards(w -> w
        .count(1)
    )
);
```

#### PHP

```php
$resp = $client->ccr()->follow([
    "index" => "follower_index",
    "wait_for_active_shards" => "1",
    "body" => [
        "remote_cluster" => "remote_cluster",
        "leader_index" => "leader_index",
        "settings" => [
            "index.number_of_replicas" => 0,
        ],
        "max_read_request_operation_count" => 1024,
        "max_outstanding_read_requests" => 16,
        "max_read_request_size" => "1024k",
        "max_write_request_operation_count" => 32768,
        "max_write_request_size" => "16k",
        "max_outstanding_write_requests" => 8,
        "max_write_buffer_count" => 512,
        "max_write_buffer_size" => "512k",
        "max_retry_delay" => "10s",
        "read_poll_timeout" => "30s",
    ],
]);
```

#### Ruby

```ruby
response = client.ccr.follow(
  index: "follower_index",
  wait_for_active_shards: "1",
  body: {
    "remote_cluster": "remote_cluster",
    "leader_index": "leader_index",
    "settings": {
      "index.number_of_replicas": 0
    },
    "max_read_request_operation_count": 1024,
    "max_outstanding_read_requests": 16,
    "max_read_request_size": "1024k",
    "max_write_request_operation_count": 32768,
    "max_write_request_size": "16k",
    "max_outstanding_write_requests": 8,
    "max_write_buffer_count": 512,
    "max_write_buffer_size": "512k",
    "max_retry_delay": "10s",
    "read_poll_timeout": "30s"
  }
)
```

## Response examples

#### Create follow index response example1

`application/json`

A successful response from `PUT /follower_index/_ccr/follow?wait_for_active_shards=1`.

```json
{
  "follow_index_created" : true,
  "follow_index_shards_acked" : true,
  "index_following_started" : true
}
```

