三、RestClient操作索引库与文档

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本文介绍了如何使用Elasticsearch官方的RestClient进行索引库的设计、创建、删除及文档操作，包括mappings配置和基本的CRUD操作。

文章目录

三、`RestClient`操作索引库与文档

三、`RestClient`操作索引库与文档

ES官方提供了各种不同语言的客户端，用来操作ES。这些客户端的本质就是组装DSL语句，通过http请求发送给ES。

官方文档地址: https://www.elastic.co/guide/en/elasticsearch/client/index.html

数据库文件：视频里展示的数据库表可以使用自己有的其他数据替代，不一定非要一致。

自己手敲了个工程项目（包含SQL文件）：测试RestClient项目文件

3.1 操作索引库

设计数据表对应的mappings

PUT /movie
{
  "mappings": {
    "properties": {
      "all":{
        "type": "text",
        "analyzer": "ik_max_word"
      },
      "movieId":{
        "type": "keyword"
      },
      "movieTitle":{
        "type": "text",
        "analyzer": "ik_max_word", 
        "copy_to": "all"
      },
      "movieIntroduction":{
        "type": "text",
        "analyzer": "ik_max_word", 
        "copy_to": "all"
      },
      "movieRating":{
        "type": "float"
      },
      "movieReleaseDate":{
        "type": "keyword", 
        "copy_to": "all"
      }
    }
  }
}

引入依赖

<properties>
    <java.version>1.8</java.version>
    <elasticsearch.version>7.12.1</elasticsearch.version>
    <mybatis-plus-boot.version>3.4.2</mybatis-plus-boot.version>
</properties>

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.12.1</version>
</dependency>

初始化

public class MovieIndexTest {
    private RestHighLevelClient client;
    @Test
    void testInit(){
        System.out.println(client);
    }
    @BeforeEach
    void setUp(){
        this.client = new RestHighLevelClient(RestClient.builder(
                HttpHost.create("http://10.120.54.174:9200")
        ));
    }
    @AfterEach
    void close() throws IOException {
        this.client.close();
    }
}

创建movie索引，CREATE_MOVIE 为上面的 mappings

public class MovieIndexTest {
    // ...........
    
    @Test
    void testCreateMovieIndex() throws IOException {
        // 创建Request
        CreateIndexRequest request = new CreateIndexRequest("movie");
        // 准备请求数据
        request.source(CREATE_MOVIE, XContentType.JSON);
        // 发送请求
        client.indices().create(request, RequestOptions.DEFAULT);
    }
    // ...........
}

删除、获取，判断是否存在

public class MovieIndexTest {
	@Test
    void testDelete() throws IOException {
        DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest("movie");
        client.indices().delete(deleteIndexRequest,RequestOptions.DEFAULT);
    }
    @Test
    void testExists() throws IOException {
        GetIndexRequest getIndexRequest = new GetIndexRequest("movie");
        boolean exists = client.indices().exists(getIndexRequest, RequestOptions.DEFAULT);
        System.out.println(exists);
    }
    @Test
    void testGet() throws IOException {
        GetIndexRequest getIndexRequest = new GetIndexRequest("movie");
        GetIndexResponse getIndexResponse = client.indices().get(getIndexRequest, RequestOptions.DEFAULT);
        System.out.println(getIndexResponse);
    }
}