OpenSearch/docs/java-rest/high-level/usage.asciidoc

[[java-rest-high-usage]]
=== Getting started

[[java-rest-high-usage-maven]]
==== Maven Repository

The high-level Java REST client is hosted on
http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.elasticsearch.client%22[Maven
Central]. The minimum Java version required is `1.8`.

The high-level REST client is subject to the same release cycle as
elasticsearch. Replace the version with the desired client version.

[[java-rest-high-usage-maven-maven]]
===== Maven configuration

Here is how you can configure the dependency using maven as a dependency manager.
Add the following to your `pom.xml` file:

["source","xml",subs="attributes"]
--------------------------------------------------
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>rest-high-level</artifactId>
    <version>{version}</version>
</dependency>
--------------------------------------------------

[[java-rest-high-usage-maven-gradle]]
===== Gradle configuration

Here is how you can configure the dependency using gradle as a dependency manager.
Add the following to your `build.gradle` file:

["source","groovy",subs="attributes"]
--------------------------------------------------
dependencies {
    compile 'org.elasticsearch.client:rest-high-level:{version}'
}
--------------------------------------------------

[[java-rest-high-usage-dependencies]]
==== Dependencies

The high-level Java REST client depends on the following artifacts and their
transitive dependencies:

- org.elasticsearch.client:rest
- org.elasticsearch:elasticsearch


[[java-rest-high-usage-initialization]]
==== Initialization

A `RestHighLevelClient` instance needs a <<java-rest-low-usage-initialization,REST low-level client>>
to be built as follows:

[source,java]
--------------------------------------------------
RestHighLevelClient client =
    new RestHighLevelClient(lowLevelRestClient); <1>
--------------------------------------------------
<1> We pass the <<java-rest-low-usage-initialization,REST low-level client>> instance

In the rest of this documentation about the high-level client, the `RestHighLevelClient` instance
will be referenced as `client`.

Then you have access to the high level APIs such as:

include::apis.asciidoc[]

Each API can be executed synchronously (i.e. <<java-rest-high-document-delete,`delete`>>) or
asynchronously (i.e. <<java-rest-high-document-delete,`deleteAsync`>>).
The asynchronous APIs require a listener that is called on thread pool managed by the low level client
when the response is received.