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Elastic Docs ›Elasticsearch Guide [7.12] ›REST APIs ›Index APIs

Create or update index alias API

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Create or update index alias API

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Creates or updates an index alias.

An index alias is a secondary name for one or more indices. Most Elasticsearch APIs accept an index alias in place of an index name.

PUT /my-index-000001/_alias/alias1

Request

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PUT /<index>/_alias/<alias>

POST /<index>/_alias/<alias>

PUT /<index>/_aliases/<alias>

POST /<index>/_aliases/<alias>

Prerequisites

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  • If the Elasticsearch security features are enabled, you must have the manage index privilege for both the index and index alias.

Path parameters

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<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.

You cannot add data streams to an index alias.

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

Query parameters

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master_timeout
(Optional, time units) Period to wait for a connection to the master node. If no response is received before the timeout expires, the request fails and returns an error. Defaults to 30s.
timeout
(Optional, time units) Period to wait for a response. If no response is received before the timeout expires, the request fails and returns an error. Defaults to 30s.

Request body

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filter

(Optional, query object) Filter query used to limit the index alias.

If specified, the index alias only applies to documents returned by the filter.

routing
(Optional, string) Custom value used to route operations to a specific shard.

Examples

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Add a time-based alias

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

PUT /logs_20302801/_alias/2030

Add a user-based alias

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

PUT /users
{
  "mappings" : {
    "properties" : {
      "user_id" : {"type" : "integer"}
    }
  }
}

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

PUT /users/_alias/user_12
{
  "routing" : "12",
  "filter" : {
    "term" : {
      "user_id" : 12
    }
  }
}

Add an alias during index creation

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You can use the create index API to add an index alias during index creation.

PUT /logs_20302801
{
  "mappings": {
    "properties": {
      "year": { "type": "integer" }
    }
  },
  "aliases": {
    "current_day": {},
    "2030": {
      "filter": {
        "term": { "year": 2030 }
      }
    }
  }
}
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