Changing the client’s initialization codeedit

The TransportClient is typically initialized as follows:

Settings settings = Settings.builder()
        .put("cluster.name", "prod").build();

TransportClient transportClient = new PreBuiltTransportClient(settings)
        .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9300))
        .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9301));

The initialization of a RestHighLevelClient is different. It requires to provide a low-level client builder as a constructor argument:

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
                new HttpHost("localhost", 9200, "http"),
                new HttpHost("localhost", 9201, "http")));
Note

The RestClient uses Elasticsearch’s HTTP service which is bounded by default on 9200. This port is different from the port used to connect to Elasticsearch with a TransportClient.

The RestHighLevelClient is thread-safe. It is typically instantiated by the application at startup time or when the first request is executed.

Once the RestHighLevelClient is initialized, it can be used to execute any of the supported APIs.

As with the TransportClient, the RestHighLevelClient must be closed when it is not needed anymore or when the application is stopped.

The code that closes the TransportClient:

transportClient.close();

must be replaced with:

client.close();