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elasticsearch版本7.10.2，要求java客户端与之相匹配，推荐Springboot版本是2.3以上版本

依赖配置使用的是JUnit 5（由<artifactId>spring-boot-starter-test</artifactId>提供支持），而@Before注解是JUnit 4中的注解。在JUnit 5中，应该使用@BeforeEach来代替@Before。
替换注解：
将所有的@Before注解替换为@BeforeEach。
确保你的测试类使用了JUnit 5的相关注解，如@Test（JUnit 5中的@Test注解位于org.junit.jupiter.api.Test）。
确保测试类正确配置：
确保你的测试类上没有使用JUnit 4的@RunWith注解。
如果使用了Spring的测试支持，确保类上有@SpringBootTest或其他相关的Spring测试注解。
更新测试方法：
确认所有的测试方法都使用了JUnit 5的@Test注解。

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.2.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><artifactId>chubemall-search</artifactId><packaging>jar</packaging><name>chubemall-search</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>1.8</java.version><spring-cloud.version>Greenwich.SR3</spring-cloud.version><elasticsearch.version>7.10.2</elasticsearch.version></properties><dependencies>
<!--        <dependency>-->
<!--            <groupId>junit</groupId>-->
<!--            <artifactId>junit</artifactId>-->
<!--            <version>3.8.1</version>-->
<!--            <scope>test</scope>-->
<!--        </dependency>--><!--引入common公共模块--><dependency><groupId>com.xd.cubemall</groupId><artifactId>cubemall-common</artifactId><version>0.0.1-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!--        <dependency>-->
<!--            <groupId>org.springframework.boot</groupId>-->
<!--            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>-->
<!--        </dependency>--><dependency><groupId>org.elasticsearch.client</groupId><artifactId>elasticsearch-rest-high-level-client</artifactId><version>7.10.2</version></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement>
</project>

1创建索引

步骤：
1.创建一个RestHightLevelClient对象，相当于和服务端建立连接
2.使用client的索引管理的对象，indices()返回索引管理对象

package com.xd.cubemall.es;import org.apache.http.HttpHost;
import org.elasticsearch.client.IndicesClient;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.junit.jupiter.api.Test;/*** 索引管理*/
public class IndexManager {@Testpublic void createIndex() throws Exception {//创建一个client对象RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(new HttpHost("1.1.1.1",9200),new HttpHost("2.2.2.2",9200),new HttpHost("3.3.3.3",9200)));//获得索引管理对象IndicesClient indicesClient = client.indices();//两个参数//1.创建索引请求对象CreateIndexRequest request = new CreateIndexRequest("hello");//2.请求选项，使用默认值。配置请求头，主要用于认证。CreateIndexResponse response = indicesClient.create(request, RequestOptions.DEFAULT);System.out.println(response);}
}

2.创建索引并设置settings信息

CreateIndexRequest对象中设置settings即可

package com.xd.cubemall.es;import org.apache.http.HttpHost;
import org.elasticsearch.client.IndicesClient;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.elasticsearch.common.settings.Settings;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;/*** 索引管理*/
public class IndexManager {private RestHighLevelClient client;@BeforeEachpublic void init() {//创建一个client对象client = new RestHighLevelClient(RestClient.builder(new HttpHost("1.1.1.1",9200),new HttpHost("2.2.2.2",9200),new HttpHost("3.3.3.3",9200)));}@Testpublic void createIndex() throws Exception {//获得索引管理对象IndicesClient indicesClient = client.indices();//两个参数//1.创建索引请求对象CreateIndexRequest request = new CreateIndexRequest("hello");//2.请求选项，使用默认值。配置请求头，主要用于认证。CreateIndexResponse response = indicesClient.create(request, RequestOptions.DEFAULT);//显示结果System.out.println(response);}@Testpublic void createIndex2() throws Exception {CreateIndexRequest request = new CreateIndexRequest("hello1").settings(Settings.builder().put("number_of_shards", 5).put("number_of_replicas",1).build());System.out.println("Client is null: " + (client == null));System.out.println("Request is null: " + (request == null));client.indices().create(request,RequestOptions.DEFAULT);}}

3.创建索引并设置mapping信息

{"properties":{"id":{"type":"long"},"title":{"type":"text","analyzer":"ik_smart","store":true},"content":{"type":"text","analyzer":"ik_smart","store":true}		}
}

    @Testpublic void createIndex3() throws Exception {XContentBuilder mappings = XContentFactory.jsonBuilder().startObject().startObject("properties").startObject("id").field("type","long").endObject().startObject("title").field("type","text").field("analyzer","ik_smart").field("store",true).endObject().startObject("content").field("type","text").field("analyzer","ik_smart").field("store",true).endObject().endObject().endObject();CreateIndexRequest request = new CreateIndexRequest("hello2").settings(Settings.builder().put("number_of_shards", 5).put("number_of_replicas",1).build()).mapping(mappings);client.indices().create(request, RequestOptions.DEFAULT);}

4.删除索引库

DeleteIndexRequest对象，其中包含索引库的名称即可
indices().delete(request)

    @Testpublic void deleteIndex() throws Exception {client.indices().delete(new DeleteIndexRequest("hello"),RequestOptions.DEFAULT);}

5.给未设置mapping的索引设置mapping

    @Testpublic void putMappings() throws Exception {String mappings = "{\n" +"\t\"properties\":{\n" +"\t\t\"id\":{\n" +"\t\t\t\"type\":\"long\"\n" +"\t\t},\n" +"\t\t\"title\":{\n" +"\t\t\t\"type\":\"text\",\n" +"\t\t\t\"analyzer\":\"ik_smart\",\n" +"\t\t\t\"store\":true\n" +"\t\t},\n" +"\t\t\"content\":{\n" +"\t\t\t\"type\":\"text\",\n" +"\t\t\t\"analyzer\":\"ik_smart\",\n" +"\t\t\t\"store\":true\n" +"\t\t}\t\t\n" +"\t}\n" +"}";PutMappingRequest request = new PutMappingRequest("hello1").source(mappings, XContentType.JSON);client.indices().putMapping(request,RequestOptions.DEFAULT);}