[[indices-alias-exists]]
=== Index alias exists API
++++
<titleabbrev>Index alias exists</titleabbrev>
++++

Checks if an index alias exists.

include::{es-repo-dir}/indices/add-alias.asciidoc[tag=index-alias-desc]

[source,console]
----
HEAD /_alias/alias1
----
// TEST[setup:my_index]
// TEST[s/^/PUT my-index-000001\/_alias\/alias1\n/]


[[alias-exists-api-request]]
==== {api-request-title}

`HEAD /_alias/<alias>`

`HEAD /<index>/_alias/<alias>`

[[alias-exists-api-prereqs]]
==== {api-prereq-title}

* If the {es} {security-features} are enabled, you must have the
`view_index_metadata` or `manage` <<privileges-list-indices,index privilege>>
for the index alias. If you specify an index, you must also have
`view_index_metadata` or `manage` index privilege for the index.

[[alias-exists-api-path-params]]
==== {api-path-parms-title}

`<alias>`::
(Required, string)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=index-alias]

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=index]

[[alias-exists-api-query-params]]
==== {api-query-parms-title}

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=expand-wildcards]
+
Defaults to `all`.

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=index-ignore-unavailable]

include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=local]


[[alias-exists-api-response-codes]]
==== {api-response-codes-title}

`200`::
Indicates all specified index aliases exist.

 `404`::
Indicates one or more specified index aliases **do not** exist.


[[alias-exists-api-example]]
==== {api-examples-title}

[source,console]
----
HEAD /_alias/2030
HEAD /_alias/20*
HEAD /logs_20302801/_alias/*
----
// TEST[s/^/PUT logs_20302801\nPUT logs_20302801\/_alias\/2030\n/]
