[[indices-add-alias]]
=== Create or update alias API
++++
<titleabbrev>Create or update alias</titleabbrev>
++++

Adds a data stream or index to an <<aliases,alias>>.

[source,console]
----
PUT my-data-stream/_alias/my-alias
----
// TEST[setup:my_data_stream]
// TEST[teardown:data_stream_cleanup]

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

`POST <target>/_alias/<alias>`

`POST <target>/_aliases/<alias>`

`PUT <target>/_alias/<alias>`

`PUT <target>/_aliases/<alias>`

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

* If the {es} {security-features} are enabled, you must have the `manage`
<<privileges-list-indices,index privilege>> for the alias and its data streams
or indices.

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

`<alias>`::
(Required, string) Alias to update. If the alias doesn't exist, the request
creates it. Index alias names support <<date-math-index-names,date math>>.

`<target>`::
(Required, string) Comma-separated list of data streams or indices to add.
Supports wildcards (`*`). Wildcard patterns that match both data streams and
indices return an error.

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

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

[[add-alias-api-request-body]]
==== {api-request-body-title}

include::aliases.asciidoc[tag=alias-options]