[[java-rest-high-cluster-put-settings]]
=== Cluster Update Settings API

The Cluster Update Settings API allows to update cluster wide settings.

[[java-rest-high-cluster-put-settings-request]]
==== Cluster Update Settings Request

A `ClusterUpdateSettingsRequest`:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/ClusterClientDocumentationIT.java[put-settings-request]
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==== Cluster Settings
At least one setting to be updated must be provided:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/ClusterClientDocumentationIT.java[put-settings-request-cluster-settings]
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<1> Sets the transient settings to be applied
<2> Sets the persistent setting 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}/ClusterClientDocumentationIT.java[put-settings-create-settings]
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<1> Creates a transient setting as `Settings`
<2> Creates a persistent setting as `Settings`

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

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

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/ClusterClientDocumentationIT.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}/ClusterClientDocumentationIT.java[put-settings-request-flat-settings]
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<1> Wether the updated settings returned in the `ClusterUpdateSettings` should
be in a flat format

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

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

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

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

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

The asynchronous execution of a cluster update settings requires both the
`ClusterUpdateSettingsRequest` instance and an `ActionListener` instance to be
passed to the asynchronous method:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/ClusterClientDocumentationIT.java[put-settings-execute-async]
--------------------------------------------------
<1> The `ClusterUpdateSettingsRequest` 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 `ClusterUpdateSettingsResponse` looks like:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/ClusterClientDocumentationIT.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-cluster-put-settings-response]]
==== Cluster Update Settings Response

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

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/ClusterClientDocumentationIT.java[put-settings-response]
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<1> Indicates whether all of the nodes have acknowledged the request
<2> Indicates which transient settings have been applied
<3> Indicates which persistent settings have been applied