[[java-rest-high-snapshot-clone-snapshot]]
=== Clone Snapshot API

The Clone Snapshot API clones part or all of a snapshot into a new snapshot.

[[java-rest-high-snapshot-clone-snapshot-request]]
==== Request

A `CloneSnapshotRequest`:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/SnapshotClientDocumentationIT.java[clone-snapshot-request]
--------------------------------------------------

==== Indices to Clone

Use `indices` to specify a list of indices from the source snapshot to include
in the snapshot clone:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/SnapshotClientDocumentationIT.java[clone-snapshot-request-indices]
--------------------------------------------------
<1> Include only `test_index` from the source snapshot.

==== Index Settings and Options

You can also customize index settings and options when cloning a snapshot:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/SnapshotClientDocumentationIT.java[clone-snapshot-request-index-settings]
--------------------------------------------------
<1> Set `IndicesOptions.Option.IGNORE_UNAVAILABLE` in `#indicesOptions()` to
    have the clone succeed even if indices are missing in the source snapshot.

==== Further Arguments

You can also provide the following optional arguments:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/SnapshotClientDocumentationIT.java[clone-snapshot-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-snapshot-clone-snapshot-sync]]
==== Synchronous Execution

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/SnapshotClientDocumentationIT.java[clone-snapshot-execute]
--------------------------------------------------

[[java-rest-high-snapshot-clone-snapshot-async]]
==== Asynchronous Execution

The asynchronous execution of a clone snapshot request requires both the
`CloneSnapshotRequest` instance and an `ActionListener` instance to be
passed to the asynchronous method:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/SnapshotClientDocumentationIT.java[clone-snapshot-execute-async]
--------------------------------------------------
<1> The `CloneSnapshotRequest` 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 `AcknowledgedResponse` looks like:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/SnapshotClientDocumentationIT.java[clone-snapshot-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-clone-snapshot-response]]
==== Response

`AcknowledgedResponse` indicates whether the request was received:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/SnapshotClientDocumentationIT.java[clone-snapshot-response]
--------------------------------------------------
<1> A boolean value of `true` if the clone successfully completed. Otherwise, the value is `false`.