[[indices-add-alias]]
=== Add index alias API
++++
<titleabbrev>Add index alias</titleabbrev>
++++

Creates or updates an index alias.

include::{docdir}/glossary.asciidoc[tag=index-alias-def]

[source,console]
----
PUT /twitter/_alias/alias1
----
// TEST[setup:twitter]


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

`PUT /<index>/_alias/<alias>`

`POST /<index>/_alias/<alias>`

`PUT /<index>/_aliases/<alias>`

`POST /<index>/_aliases/<alias>`


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

`<index>`::
(Required, string)
Comma-separated list or wildcard expression of index names
to add to the alias.
+
To add all indices in the cluster to the alias,
use a value of `_all`.

`<alias>`::
(Required, string)
Name of the index alias to create or update.


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

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


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

`filter`::
(Required, query object)
include::{docdir}/rest-api/common-parms.asciidoc[tag=index-alias-filter]

include::{docdir}/rest-api/common-parms.asciidoc[tag=index-routing]

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

[[alias-adding]]
===== Add a time-based alias

The following request creates an alias, `2030`,
for the `logs_20302801` index.

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

[[add-alias-api-user-ex]]
===== Add a user-based alias

First, create an index, `users`,
with a mapping for the `user_id` field:

[source,console]
--------------------------------------------------
PUT /users
{
    "mappings" : {
        "properties" : {
            "user_id" : {"type" : "integer"}
        }
    }
}
--------------------------------------------------

Then add the index alias for a specific user, `user_12`:

[source,console]
--------------------------------------------------
PUT /users/_alias/user_12
{
    "routing" : "12",
    "filter" : {
        "term" : {
            "user_id" : 12
        }
    }
}
--------------------------------------------------
// TEST[continued]

[[alias-index-creation]]
===== Add an alias during index creation

You can use the <<create-index-aliases,create index API>>
to add an index alias during index creation.

[source,console]
--------------------------------------------------
PUT /logs_20302801
{
    "mappings" : {
        "properties" : {
            "year" : {"type" : "integer"}
        }
    },
    "aliases" : {
        "current_day" : {},
        "2030" : {
            "filter" : {
                "term" : {"year" : 2030 }
            }
        }
    }
}
--------------------------------------------------