[[java-rest-high-indices-put-settings]]
=== Update Indices Settings API

The Update Indices Settings API allows to change specific index level settings.

[[java-rest-high-indices-put-settings-request]]
==== Update Indices Settings Request

An `UpdateSettingsRequest`:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-request]
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<1> Update settings for one index
<2> Update settings for multiple indices
<3> Update settings for all indices

==== Indices Settings
At least one setting to be updated must be provided:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-create-settings]
--------------------------------------------------
<1> Sets the index settings to be applied

==== Providing the Settings
The settings to be applied can be provided in different ways:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-create-settings]
--------------------------------------------------
<1> Creates a setting as `Settings`

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-settings-builder]
--------------------------------------------------
<1> Settings provided as `Settings.Builder`

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-settings-source]
--------------------------------------------------
<1> Settings provided as `String`

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-settings-map]
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<1> Settings provided as a `Map`

==== Optional Arguments
The following arguments can optionally be provided:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-request-preserveExisting]
--------------------------------------------------
<1> Whether to update existing settings. If set to `true` existing settings
on an index remain unchanged, the default is `false`

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-request-timeout]
--------------------------------------------------
<1> Timeout to wait for the all the nodes to acknowledge the new setting
as a `TimeValue`
<2> Timeout to wait for the all the nodes to acknowledge the new setting
as a `String`

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-request-masterTimeout]
--------------------------------------------------
<1> Timeout to connect to the master node as a `TimeValue`
<2> Timeout to connect to the master node as a `String`

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-request-indicesOptions]
--------------------------------------------------
<1> Setting `IndicesOptions` controls how unavailable indices are resolved and
how wildcard expressions are expanded

[[java-rest-high-indices-put-settings-sync]]
==== Synchronous Execution

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-execute]
--------------------------------------------------

[[java-rest-high-indices-put-settings-async]]
==== Asynchronous Execution

The asynchronous execution of an indices update settings requires both the
`UpdateSettingsRequest` instance and an `ActionListener` instance to be
passed to the asynchronous method:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-execute-async]
--------------------------------------------------
<1> The `UpdateSettingsRequest` to execute and the `ActionListener`
to use when the execution completes

The asynchronous method does not block and returns immediately. Once it is
completed the `ActionListener` is called back using the `onResponse` method
if the execution successfully completed or using the `onFailure` method if
it failed.

A typical listener for `UpdateSettingsResponse` looks like:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-execute-listener]
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<1> Called when the execution is successfully completed. The response is
provided as an argument
<2> Called in case of a failure. The raised exception is provided as an argument

[[java-rest-high-indices-put-settings-response]]
==== Update Indices Settings Response

The returned `UpdateSettingsResponse` allows to retrieve information about the
executed operation as follows:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[put-settings-response]
--------------------------------------------------
<1> Indicates whether all of the nodes have acknowledged the request