Elasticsearch-Rest-Client：官方RestClient，封装了ES操作，API层次分明，上手简单。

1. 导入依赖

<dependency>
   <groupId>org.elasticsearch.client</groupId>
   <artifactId>elasticsearch-rest-high-level-client</artifactId>
   <version>7.5.0</version>
</dependency>

 2. 编写配置

@Configuration
public class ElasticSearchConfig{public static final RequestOptions COMMON_OPTIONS;static{RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder();COMMON_OPTIONS = builder.build();}@Beanpublic RestHighLevelClient esRestClient(){RestHighLevelClient  client = new RestHighLevelClient(RestClient.builder(new HttpHost("192.168.100.120",9200,"http")));return client;}
}

3. 测试 

@RunWith(SpringRunner.class)
@SpringBootTest
public class ApplicationTest {@AutowiredRestHighLevelClient client;@Testpublic void loadClient(){System.out.println(client);}
}

4. 同步保存

5. 异步保存

6. 复杂的检索

6.1 聚合条件

6.2 提取查询结果