1.RestClient
/** * Client that connects to an Elasticsearch cluster through HTTP. * <p> * Must be created using {@link RestClientBuilder}, which allows to set all the different options or just rely on defaults. * The hosts that are part of the cluster need to be provided at creation time, but can also be replaced later * by calling {@link #setNodes(Collection)}. * <p> * The method {@link #performRequest(Request)} allows to send a request to the cluster. When * sending a request, a host gets selected out of the provided ones in a round-robin fashion. Failing hosts are marked dead and * retried after a certain amount of time (minimum 1 minute, maximum 30 minutes), depending on how many times they previously * failed (the more failures, the later they will be retried). In case of failures all of the alive nodes (or dead nodes that * deserve a retry) are retried until one responds or none of them does, in which case an {@link IOException} will be thrown. * <p> * Requests can be either synchronous or asynchronous. The asynchronous variants all end with {@code Async}. * <p> * Requests can be traced by enabling trace logging for "tracer". The trace logger outputs requests and responses in curl format. */
2.RestHighLevelClient
/** * High level REST client that wraps an instance of the low level {@link RestClient} and allows to build requests and read responses. * The {@link RestClient} instance is internally built based on the provided {@link RestClientBuilder} and it gets closed automatically * when closing the {@link RestHighLevelClient} instance that wraps it. * In case an already existing instance of a low-level REST client needs to be provided, this class can be subclassed and the * {@link #RestHighLevelClient(RestClient, CheckedConsumer, List)} constructor can be used. * This class can also be sub-classed to expose additional client methods that make use of endpoints added to Elasticsearch through * plugins, or to add support for custom response sections, again added to Elasticsearch through plugins. */
2.1 IndicesClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for accessing the Indices API. * <p> * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/indices.html">Indices API on elastic.co</a> */
2.2 ClusterClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for accessing the Cluster API. * <p> * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster.html">Cluster API on elastic.co</a> */
2.3 IngestClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for accessing the Ingest API. * <p> * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest.html">Ingest API on elastic.co</a> */
2.4 SnapshotClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for accessing the Snapshot API. * <p> * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-snapshots.html">Snapshot API on elastic.co</a> */
2.5 TasksClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for accessing the Tasks API. * <p> * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/tasks.html">Task Management API on elastic.co</a> */
2.6 XPackClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for * accessing the Elastic Licensed X-Pack APIs that are shipped with the * default distribution of Elasticsearch. All of these APIs will 404 if run * against the OSS distribution of Elasticsearch. * <p> * See the <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/xpack-api.html"> * X-Pack APIs on elastic.co</a> for more information. */
2.7 WatcherClient
/** * Start the watch service * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/watcher-api-start.html"> * the docs</a> for more. * @param request the request * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized * @return the response * @throws IOException in case there is a problem sending the request or parsing back the response */
2.8 GraphClient
/** * Executes an exploration request using the Graph API. * * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/graph-explore-api.html">Graph API * on elastic.co</a>. */
2.9 LicenseClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for * accessing the Elastic License-related methods * <p> * See the <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/licensing-apis.html"> * X-Pack Licensing APIs on elastic.co</a> for more information. */
2.10 MigrationClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for * accessing the Elastic License-related methods * <p> * See the <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/migration-api.html"> * X-Pack Migration APIs on elastic.co</a> for more information. */
2.11 MachineLearningClient
/** * Machine Learning API client wrapper for the {@link RestHighLevelClient} * <p> * See the <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/ml-apis.html"> * X-Pack Machine Learning APIs </a> for additional information. */
2.12 SecurityClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for accessing the Security APIs. * <p> * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api.html">Security APIs on elastic.co</a> */
2.13 RollupClient
/** * A wrapper for the {@link RestHighLevelClient} that provides methods for * accessing the Elastic Rollup-related methods * <p> * See the <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/rollup-apis.html"> * X-Pack Rollup APIs on elastic.co</a> for more information. */
3.TransportClient
/** * The transport client allows to create a client that is not part of the cluster, but simply connects to one * or more nodes directly by adding their respective addresses using * {@link #addTransportAddress(org.elasticsearch.common.transport.TransportAddress)}. * <p> * The transport client important modules used is the {@link org.elasticsearch.common.network.NetworkModule} which is * started in client mode (only connects, no bind). * * @deprecated {@link TransportClient} is deprecated in favour of the High Level REST client and will * be removed in Elasticsearch 8.0. */