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创建MAVEN项目，maven依赖如下：
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>6.2.4</version>
</dependency>
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>transport</artifactId>
<version>6.2.4</version>
</dependency>查询方式如下：
RestClient restClient = RestClient.builder(new HttpHost("192.168.43.22", 9200, "http")).build();
System.out.println(123);
Map<String,String> params = new HashMap<String, String>();
HttpEntity entity = new NStringEntity("{\"query\":{\"bool\":{\"must\":[{\"term\":{\"host.keyword\":\"media-for-the-masses.theacademyofperformingartsandscience.org\"}}],\"must_not\":[],\"should\":[]}},\"from\":0,\"size\":10,\"sort\":[],\"aggs\":{}}",
ContentType.APPLICATION_JSON);
Response response = restClient.performRequest("GET", "/logstash-2015.05.20/_search", params, entity);
System.out.println(EntityUtils.toString(response.getEntity()));logstash-2015.05.20为索引名称，json为DSL查询json语句，可在head中验证后直接查询