步骤：

1、修改pom文件

将

<!--ES-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

 替换为

<!--OPENSEARCH-->
<dependency>
    <groupId>org.opensearch.client</groupId>
    <artifactId>opensearch-rest-high-level-client</artifactId>
    <version>2.6.0</version>
</dependency>

2、修改config配置文件,将elasticsearch 的相关类替换为opensearch

将引入的类改为opensearch

import org.opensearch.client.RestClient;
import org.opensearch.client.RestHighLevelClient;


@Bean(value = "RestHighLevelClient", destroyMethod = "close")
public RestHighLevelClient restHighLevelClient(){
    //解析hostlist配置信息
    String[] split = hostlist.split(",");
    //创建HttpHost数组，其中存放es主机和端口的配置信息
    HttpHost[] httpHostArray = new HttpHost[split.length];
    for(int i=0;i<split.length;i++){
        String item = split[i];
        httpHostArray[i] = new HttpHost(item.split(":")[0], Integer.parseInt(item.split(":")[1]), "http");
    }
    //创建RestHighLevelClient客户端
    return new RestHighLevelClient(RestClient.builder(httpHostArray).setHttpClientConfigCallback(httpClientBuilder -> {

        httpClientBuilder.setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE);
        BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY,new UsernamePasswordCredentials(userName, password));
        httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
        return httpClientBuilder;
    }));

}

3、代码中操作 opensearch的接口基本不需要改动，只需要将引入的类改为opensearch即可

import org.opensearch.action.search.SearchRequest;
import org.opensearch.action.search.SearchResponse;
import org.opensearch.client.RequestOptions;
import org.opensearch.client.RestHighLevelClient;
import org.opensearch.index.query.BoolQueryBuilder;
import org.opensearch.index.query.QueryBuilders;

 4、使用OpenSearch 需要jdk11 ,否则编译会报错