Clear cache API

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

POST /<target>/_cache/clear

POST /_cache/clear

Path parameters

<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

allow_no_indices

(Optional, boolean) If true, the request does not return an error if a wildcard expression or _all value retrieves only missing or closed indices.

This parameter also applies to index aliases that point to a missing or closed index.

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 true, missing or closed indices are not included in the response. Defaults to false.

query

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

request

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

Examples

Clear a specific cache

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

Clear the cache of specific fields

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

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

Clear caches for several data streams and indices

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

Clear caches for all data streams and indices

POST /_cache/clear