1、pom文件导入ES依赖

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.4.2</version>
</dependency>

2、编写配置，给容器中注入一个RestHighLevelClient

@Configuration
public class GulimallElasticSearchConfig {

    public static final RequestOptions COMMON_OPTIONS;

    static {
        RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder();
        COMMON_OPTIONS = builder.build();
    }

    @Bean
    public RestHighLevelClient esClient(){
        RestClientBuilder builder = RestClient.builder(new HttpHost("192.168.146.129", 9200, "http"));
        return new RestHighLevelClient(builder);
    }
}

3、测试程序

@Test
    public void indexData() throws IOException {
        IndexRequest indexRequest = new IndexRequest("users");
        // 数据ID
        indexRequest.id("1");
        User user = new User();
        user.setUserName("zhangsan");
        user.setGender("male");
        user.setAge(20);
        String jsonString = JSON.toJSONString(user);
        indexRequest.source(jsonString, XContentType.JSON); // 要保存的内容

        // 使用客户端执行操作
        IndexResponse index = client.index(indexRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
        System.out.println(index);
    }

4、查看ES，数据已存入到ES

5、带检索条件的查询

@Test
    public void searchData() throws IOException {
        // 1、创建检索请求
        SearchRequest searchRequest = new SearchRequest();
        // 2、指定索引
        searchRequest.indices("users");
        // 3、指定DSL,检索条件
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        // 够造检索条件
        sourceBuilder.query(QueryBuilders.matchQuery("userName", "zhangsan"));

        searchRequest.source(sourceBuilder);
        // 4、执行检索
        SearchResponse searchResponse = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
        System.out.println("---------> " + searchResponse);
    }

打印结果：

{
    "took": 5,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 1,
            "relation": "eq"
        },
        "max_score": 0.2876821,
        "hits": [
            {
                "_index": "users",
                "_type": "_doc",
                "_id": "1",
                "_score": 0.2876821,
                "_source": {
                    "age": 20,
                    "gender": "male",
                    "userName": "zhangsan"
                }
            }
        ]
    }
}