We must be sure that Maven loads the thrift library adding to the pom.xml file; the code lines are:

<dependency>
  <groupId>org.apache.thrift</groupId>
  <artifactId>libthrift</artifactId>
  <version>0.9.1</version>
</dependency>

In Java, creating a client is quite easy using ElasticSearch generated classes:

import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
import org.elasticsearch.thrift.*;
TTransport transport = new TSocket("127.0.0.1", 9500);
TProtocol protocol = new TBinaryProtocol(transport);
Rest.Client client = new Rest.Client(protocol);
transport.open();

To initialize a connection, first we need to open a socket transport. This is done with the TSocket(host, port) setting, using the ElasticSearch thrift standard port 9500.

Then the socket transport protocol must be encapsulated in a binary protocol, this is done with the TBinaryProtocol(transport) parameter.

Now, a client can be initialized by passing the protocol. The Rest.Client utility class and other utility classes are generated by elasticsearch.thrift. It resides in the org.elasticsearch.thrift namespace.

To have a fully working client, we must open the socket (transport.open()).

At the end of program, we should close the client connection (transport.close()).