144 lines
5.9 KiB
Plaintext
144 lines
5.9 KiB
Plaintext
[[java-rest-high-getting-started]]
|
|
== Getting started
|
|
|
|
This section describes how to get started with the high-level REST client from
|
|
getting the artifact to using it in an application.
|
|
|
|
[[java-rest-high-compatibility]]
|
|
=== Compatibility
|
|
The Java High Level REST Client requires Java 1.8 and depends on the Elasticsearch
|
|
core project. The client version is the same as the Elasticsearch version that the
|
|
client was developed for. It accepts the same request arguments as the `TransportClient`
|
|
and returns the same response objects. See the <<java-rest-high-level-migration>>
|
|
if you need to migrate an application from `TransportClient` to the new REST client.
|
|
|
|
The High Level Client is guaranteed to be able to communicate with any Elasticsearch
|
|
node running on the same major version and greater or equal minor version. It
|
|
doesn't need to be in the same minor version as the Elasticsearch nodes it
|
|
communicates with, as it is forward compatible meaning that it supports
|
|
communicating with later versions of Elasticsearch than the one it was developed for.
|
|
|
|
The 6.0 client is able to communicate with any 6.x Elasticsearch node, while the 6.1
|
|
client is for sure able to communicate with 6.1, 6.2 and any later 6.x version, but
|
|
there may be incompatibility issues when communicating with a previous Elasticsearch
|
|
node version, for instance between 6.1 and 6.0, in case the 6.1 client supports new
|
|
request body fields for some APIs that are not known by the 6.0 node(s).
|
|
|
|
It is recommended to upgrade the High Level Client when upgrading the Elasticsearch
|
|
cluster to a new major version, as REST API breaking changes may cause unexpected
|
|
results depending on the node that is hit by the request, and newly added APIs will
|
|
only be supported by the newer version of the client. The client should always be
|
|
updated last, once all of the nodes in the cluster have been upgraded to the new
|
|
major version.
|
|
|
|
[[java-rest-high-javadoc]]
|
|
=== Javadoc
|
|
|
|
The javadoc for the REST high level client can be found at {rest-high-level-client-javadoc}/index.html.
|
|
|
|
[[java-rest-high-getting-started-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-getting-started-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>elasticsearch-rest-high-level-client</artifactId>
|
|
<version>{version}</version>
|
|
</dependency>
|
|
--------------------------------------------------
|
|
|
|
[[java-rest-high-getting-started-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:elasticsearch-rest-high-level-client:{version}'
|
|
}
|
|
--------------------------------------------------
|
|
|
|
[[java-rest-high-getting-started-maven-lucene]]
|
|
==== Lucene Snapshot repository
|
|
|
|
The very first releases of any major version (like a beta), might have been built on top of a Lucene Snapshot version.
|
|
In such a case you will be unable to resolve the Lucene dependencies of the client.
|
|
|
|
For example, if you want to use the `6.0.0-beta1` version which depends on Lucene `7.0.0-snapshot-00142c9`, you must
|
|
define the following repository.
|
|
|
|
For Maven:
|
|
|
|
["source","xml",subs="attributes"]
|
|
--------------------------------------------------
|
|
<repository>
|
|
<id>elastic-lucene-snapshots</id>
|
|
<name>Elastic Lucene Snapshots</name>
|
|
<url>http://s3.amazonaws.com/download.elasticsearch.org/lucenesnapshots/00142c9</url>
|
|
<releases><enabled>true</enabled></releases>
|
|
<snapshots><enabled>false</enabled></snapshots>
|
|
</repository>
|
|
--------------------------------------------------
|
|
|
|
For Gradle:
|
|
|
|
["source","groovy",subs="attributes"]
|
|
--------------------------------------------------
|
|
maven {
|
|
url 'http://s3.amazonaws.com/download.elasticsearch.org/lucenesnapshots/00142c9'
|
|
}
|
|
--------------------------------------------------
|
|
|
|
[[java-rest-high-getting-started-dependencies]]
|
|
=== Dependencies
|
|
|
|
The High Level Java REST Client depends on the following artifacts and their
|
|
transitive dependencies:
|
|
|
|
- org.elasticsearch.client:elasticsearch-rest-client
|
|
- org.elasticsearch:elasticsearch
|
|
|
|
|
|
[[java-rest-high-getting-started-initialization]]
|
|
=== Initialization
|
|
|
|
A `RestHighLevelClient` instance needs a <<java-rest-low-usage-initialization,REST low-level client builder>>
|
|
to be built as follows:
|
|
|
|
["source","java",subs="attributes,callouts,macros"]
|
|
--------------------------------------------------
|
|
include-tagged::{doc-tests}/MainDocumentationIT.java[rest-high-level-client-init]
|
|
--------------------------------------------------
|
|
|
|
The high-level client will internally create the low-level client used to
|
|
perform requests based on the provided builder, and manage its lifecycle.
|
|
|
|
The high-level client instance needs to be closed when no longer needed so that
|
|
all the resources used by it get properly released, as well as the underlying
|
|
http client instance and its threads. This can be done through the `close`
|
|
method, which will close the internal `RestClient` instance.
|
|
|
|
["source","java",subs="attributes,callouts,macros"]
|
|
--------------------------------------------------
|
|
include-tagged::{doc-tests}/MainDocumentationIT.java[rest-high-level-client-close]
|
|
--------------------------------------------------
|
|
|
|
In the rest of this documentation about the Java High Level Client, the `RestHighLevelClient` instance
|
|
will be referenced as `client`.
|