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Alias exists API

Checks if an alias exists.

HEAD _alias/my-alias

Request

HEAD _alias/<alias>

HEAD <target>/_alias/<alias>

Prerequisites

If the Elasticsearch security features are enabled, you must have the view_index_metadata or manage index privilege for the alias. If you specify a target, you must also have the view_index_metadata or manage index privilege for the target.

Path parameters

<alias>: (Optional, string) Comma-separated list of aliases to check. Supports wildcards (*).
<target>: (Optional, string) Comma-separated list of data streams or indices used to limit the request. Supports wildcards (*). To target all data streams and indices, omit this parameter or use * or _all.

Query parameters

expand_wildcards

(Optional, string) Type of index that wildcard patterns can match. If the request can target data streams, this argument determines whether wildcard expressions match hidden data streams. Supports comma-separated values, such as open,hidden. Valid values are:

all: Match any data stream or index, including hidden ones.
open: Match open, non-hidden indices. Also matches any non-hidden data stream.
closed: Match closed, non-hidden indices. Also matches any non-hidden data stream. Data streams cannot be closed.
hidden: Match hidden data streams and hidden indices. Must be combined with open, closed, or both.
none: Wildcard patterns are not accepted.

Defaults to all.

ignore_unavailable

(Optional, Boolean) If false, requests that include a missing data stream or index in the <target> return an error. Defaults to false.

local

(Optional, Boolean) If true, the request retrieves information from the local node only. Defaults to false, which means information is retrieved from the master node.

Response codes

200: All specified aliases exist.
404: One or more of the specified aliases don’t exist.

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/indices-alias-exists.html