[elastic 8.x]java客户端连接elasticsearch与操作索引与文档

import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.common.xcontent.XContentType;
 
public class ElasticSearchJavaClientExample {
 
    public static void main(String[] args) throws IOException {
        // 创建Elasticsearch客户端
        RestClientBuilder builder = RestClient.builder(new HttpHost("localhost", 9200, "http"));
        RestHighLevelClient client = new RestHighLevelClient(builder);
 
        // 索引一个文档
        IndexRequest indexRequest = new IndexRequest("posts");
        indexRequest.id("1");
        String jsonString = "{" +
                "\"user\":\"kimchy\"," +
                "\"postDate\":\"2023-04-07\"," +
                "\"message\":\"trying out Elasticsearch\"" +
                "}";
        indexRequest.source(jsonString, XContentType.JSON);
        IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
 
        // 获取一个文档
        GetRequest getRequest = new GetRequest("posts", "1");
        GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);
 
        // 删除一个文档
        DeleteRequest deleteRequest = new DeleteRequest("posts", "1");
        DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT);
 
        // 搜索文档
        SearchRequest searchRequest = new SearchRequest("posts");
        SearchSourceBuilder searchSourceBuilder = ne