IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Clear cache API

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Clear cache API

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Clears the caches of one or more indices. For data streams, the API clears the caches of the stream’s backing indices.

POST /my-index-000001/_cache/clear

Request

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POST /<target>/_cache/clear

POST /_cache/clear

Prerequisites

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If the Elasticsearch security features are enabled, you must have the manage index privilege for the target data stream, index, or index alias.

Path parameters

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<target>

(Optional, string) Comma-separated list of data streams, indices, and index aliases used to limit the request. Wildcard expressions (*) are supported.

To target all data streams and indices in a cluster, omit this parameter or use _all or *.

Query parameters

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allow_no_indices

(Optional, Boolean) If false, the request returns an error if any wildcard expression, index alias, or _all value targets only missing or closed indices. This behavior applies even if the request targets other open indices. For example, a request targeting foo*,bar* returns an error if an index starts with foo but no index starts with bar.

Defaults to true.

expand_wildcards

(Optional, string) Controls what kind of indices that wildcard expressions can expand to. Multiple values are accepted when separated by a comma, as in open,hidden. Valid values are:

all: Expand to open and closed indices, including hidden indices.
open: Expand only to open indices.
closed: Expand only to closed indices.
hidden: Expansion of wildcards will include hidden indices. Must be combined with open, closed, or both.
none: Wildcard expressions are not accepted.

Defaults to open.

fielddata

(Optional, Boolean) If true, clears the fields cache.

Use the fields parameter to clear the cache of specific fields only.

fields

(Optional, string) Comma-separated list of field names used to limit the fielddata parameter.

Defaults to all fields.

This parameter does not support objects or field aliases.

index

(Optional, string) Comma-separated list of index names used to limit the request.

ignore_unavailable

(Optional, Boolean) If false, the request returns an error if it targets a missing or closed index. Defaults to false.

query

(Optional, Boolean) If true, clears the query cache.

request

(Optional, Boolean) If true, clears the request cache.

Examples

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Clear a specific cache

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By default, the clear cache API clears all caches. You can clear only specific caches by setting the following query parameters to true:

fielddata
query
request

POST /my-index-000001/_cache/clear?fielddata=true  
POST /my-index-000001/_cache/clear?query=true      
POST /my-index-000001/_cache/clear?request=true

	Clears only the fields cache
	Clears only the query cache
	Clears only the request cache

Clear the cache of specific fields

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To only clear the cache of specific fields, use the fields query parameter.

POST /my-index-000001/_cache/clear?fields=foo,bar

Clear the cache for the foo and bar field

Clear caches for several data streams and indices

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POST /my-index-000001,my-index-000002/_cache/clear

Clear caches for all data streams and indices

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POST /_cache/clear

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