[[java-rest-high-cluster-get-settings]]
=== Cluster Get Settings API

The Cluster Get Settings API allows to get the cluster wide settings.

[[java-rest-high-cluster-get-settings-request]]
==== Cluster Get Settings Request

A `ClusterGetSettingsRequest`:

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

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

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/ClusterClientDocumentationIT.java[get-settings-request-includeDefaults]
--------------------------------------------------
<1> By default only those settings that were explicitly set are returned. Setting this to true also returns
the default settings.

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/ClusterClientDocumentationIT.java[get-settings-request-local]
--------------------------------------------------
<1> By default the request goes to the master of the cluster to get the latest results. If local is specified it gets
the results from whichever node the request goes to.

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

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

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/ClusterClientDocumentationIT.java[get-settings-execute]
--------------------------------------------------
<1> Execute the request and get back the response in a `ClusterGetSettingsResponse` object.

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

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

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

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/ClusterClientDocumentationIT.java[get-settings-execute-listener]
--------------------------------------------------
<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-get-settings-response]]
==== Cluster Get Settings Response

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

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/ClusterClientDocumentationIT.java[get-settings-response]
--------------------------------------------------
<1> Get the persistent settings.
<2> Get the transient settings.
<3> Get the default settings (returns empty settings if `includeDefaults` was not set to `true`).
<4> Get the value as a `String` for a particular setting. The order of searching is first in `persistentSettings` then in
`transientSettings` and finally, if not found in either, in `defaultSettings`.