OpenSearch/docs/java-rest/high-level/indices/create_index.asciidoc

[[java-rest-high-create-index]]
=== Create Index API

[[java-rest-high-create-index-request]]
==== Create Index Request

A `CreateIndexRequest` requires an `index` argument:

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-request]
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<1> The index to create

==== Index settings
Each index created can have specific settings associated with it.

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-request-settings]
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<1> Settings for this index

[[java-rest-high-create-index-request-mappings]]
==== Index mappings
An index may be created with mappings for its document types

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-request-mappings]
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<1> The type to define
<2> The mapping for this type, provided as a JSON string

The mapping source can be provided in different ways in addition to the
`String` example shown above:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-mappings-map]
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<1> Mapping source provided as a `Map` which gets automatically converted
to JSON format

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-mappings-xcontent]
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<1> Mapping source provided as an `XContentBuilder` object, the Elasticsearch
built-in helpers to generate JSON content

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-mappings-shortcut]
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<1> Mapping source provided as `Object` key-pairs, which gets converted to
JSON format

==== Index aliases
Aliases can be set at index creation time

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-request-aliases]
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<1> The alias to define

==== Providing the whole source

The whole source including all of its sections (mappings, settings and aliases)
can also be provided:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-whole-source]
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<1> The source provided as a JSON string. It can also be provided as a `Map`
or an `XContentBuilder`.

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

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-request-timeout]
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<1> Timeout to wait for the all the nodes to acknowledge the index creation as a `TimeValue`
<2> Timeout to wait for the all the nodes to acknowledge the index creation as a `String`

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-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`

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-request-waitForActiveShards]
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<1> The number of active shard copies to wait for before the create index API returns a
response, as an `int`
<2> The number of active shard copies to wait for before the create index API returns a
response, as an `ActiveShardCount`

[[java-rest-high-create-index-sync]]
==== Synchronous Execution

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-execute]
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[[java-rest-high-create-index-async]]
==== Asynchronous Execution

The asynchronous execution of a create index request requires both the `CreateIndexRequest`
instance and an `ActionListener` instance to be passed to the asynchronous
method:

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-execute-async]
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<1> The `CreateIndexRequest` 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 `CreateIndexResponse` looks like:

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-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 failure. The raised exception is provided as an argument

[[java-rest-high-create-index-response]]
==== Create Index Response

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

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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[create-index-response]
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<1> Indicates whether all of the nodes have acknowledged the request
<2> Indicates whether the requisite number of shard copies were started for each shard in the index before timing out