--
:api: get-alias
:request: GetAliasesRequest
:response: GetAliasesResponse
--

[id="{upid}-{api}"]
=== Get Alias API

[id="{upid}-{api}-request"]
==== Get Alias Request

The Get Alias API uses +{request}+ as its request object.
One or more aliases can be optionally provided either at construction
time or later on through the relevant setter method.

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests-file}[{api}-request]
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==== Optional arguments
The following arguments can optionally be provided:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests-file}[{api}-request-alias]
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<1> One or more aliases to retrieve

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests-file}[{api}-request-indices]
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<1> The index or indices that the alias is associated with

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests-file}[{api}-request-indicesOptions]
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<1> Setting `IndicesOptions` controls how unavailable indices are resolved and
how wildcard expressions are expanded when looking for aliases that belong to
specified indices.

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests-file}[{api}-request-local]
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<1> The `local` flag (defaults to `false`) controls whether the aliases need
to be looked up in the local cluster state or in the cluster state held by
the elected master node

include::../execution.asciidoc[]

[id="{upid}-{api}-response"]
==== Get Alias Response

The returned +{response}+ allows to retrieve information about the
executed operation as follows:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests-file}[{api}-response]
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<1> Retrieves a map of indices and their aliases

+{response}+ class contains information about errors if they occurred.
This info could be in fields `error` or `exception` depends on a case.

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests-file}[{api}-response-error]
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<1> Client sets status to `NOT_FOUND` if at least one item of specified
indices or aliases is not found. Otherwise it is `OK`.

<2> If at least one item of specified indices isn't exist client sets
`ElasticsearchException` and returns empty result.

<3> If at least one item of specified aliases ins't exist client puts
error description in `error` field and returns partial result if any
of other patterns match.

If user specified indices or aliases as regular expressions
and nothing was found client returns `OK` status and no errors.