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Hibernate Search Backend relying on remote Elasticsearch clusters

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/*
 * Hibernate Search, full-text search for your domain model
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.search.backend.elasticsearch;

import org.hibernate.search.engine.backend.Backend;
import org.hibernate.search.util.common.SearchException;

public interface ElasticsearchBackend extends Backend {

	/**
	 * Retrieve the underlying, low-level client used to communicate with the Elasticsearch cluster.
	 * 
	 * WARNING - Unsupported API: the underlying client class may change without notice.
	 *
	 * @param clientClass The {@link Class} representing the expected client type
	 * @param  The expected client type
	 * @return The client.
	 * @throws SearchException if the underlying client does not implement the given class.
	 */
	 T client(Class clientClass);

}