ElasticSearch7.X Java client

<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>7.2.0</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.2.0</version>
</dependency>

import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;

/**
 * @author 
 * @version 1.0
 * @description TODO
 * @date 2020/4/19 20:38
 **/
public class EsClient {

    private static RestHighLevelClient client = null;

    public static synchronized RestHighLevelClient getEsClient() {
        if (client == null){
            client = new RestHighLevelClient(RestClient.builder(
                    new HttpHost("192.168.242.20", 9200, "http")
            ));
        }
        return client;
    }
}