JavaRestClient（es的java实现）(P123~P141)

客户端初始化

1.引入依赖

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

2.覆盖默认es版本

在父工程里面指定，因为父工程可以全部匹配，这里用老版本呢是因为新版本api变化太大，而且企业中多用老版本，所以使用老版本。

  <properties>
      <maven.compiler.source>11</maven.compiler.source>
      <maven.compiler.target>11</maven.compiler.target>
      <elasticsearch.version>7.12.1</elasticsearch.version>
  </properties>

3.初始化RestHightClient

RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(
        HttpHost.create("http://192.168.150.101:9200")
));

商品mapping映射

#商品索引库
PUT /hmall
{
  "mappings": {
    "properties": {
      "id":{
        "type": "keyword"
      },
      "name":{
        "type": "text",
        "analyzer": "ik_smart"
      },
      "price":{
        "type": "integer"
      },
      "image":{
        "type": "keyword",
        "index": false
      },
      "category":{
        "type": "keyword"
      },
      "brand":{
        "type": "keyword"
      },
      "sold":{
        "type": "integer"
      },
      "commentCount":{
        "type": "integer",
        "index":false
      },
      "isAD":{
        "type": "boolean"
      },
      "updateTime":{
        "type": "date"
      }
    }
  }
}

索引库操作

public class ElasticTest {

    private RestHighLevelClient client;

    @Test
    void CreatIndex() throws IOException {
        //准备Request对象
        CreateIndexRequest request = new CreateIndexRequest("items");
        //准备请求参数
        request.source(Mapping, XContentType.JSON);
        //发送请求
        client.indices().create(request, RequestOptions.DEFAULT);
    }

    @Test
    void GetIndex() throws IOException {
        //创建对象
        GetIndexRequest request = new GetIndexRequest("items");
        boolean exists = client.indices().exists(request,RequestOptions.DEFAULT);
        System.out.println("exists = "+exists);
    }

    @Test
    void DeleteIndex() throws IOException {
        //创建对象
        DeleteIndexRequest request = new DeleteIndexRequest("items");
        client.indices().delete(request,RequestOptions.DEFAULT);
    }

    @BeforeEach
    void setUp(){
        client = new RestHighLevelClient(RestClient.builder(
                HttpHost.create(&#