JAVA API调用elasticsearch实现基本增删改查

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.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.common.xcontent.XContentType;
 
public class ElasticSearchExample {
 
    private static final String HOST = "http://localhost:9200";
    private static final RestClientBuilder builder = RestClient.builder(new HttpHost(HOST));
    private static final RestHighLevelClient client = new RestHighLevelClient(builder);
 
    public static void main(String[] args) throws IOException {
        createIndex();
        getData();
        updateData();
        deleteData();
        client.close();
    }
 
    private static void createIndex() throws IOException {
        IndexRequest request = new IndexRequest("posts", "doc", "1");
        String jsonString = "{" +
                "\"user\":\"kimchy\"," +
                "\"postDate\":\"2023-04-07\"," +
                "\"message\":\"trying out Elasticsearch\"" +
                "}";
        request.source(jsonString, XContentType.JSON);
        IndexResponse response = client.index(request, RequestOptions.DEFAULT);
        System.out.println("Index Response Status:" + response.status());
    }
 
    private static void getData() throws IOException {
        GetRequest getRequest = new GetRequest("posts", "doc", "1");
        GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);
        System.out.println(getResponse.getSourceAsString());
    }
 
    private static void updateData() throws IOException {
        UpdateRequest updateRequest = new UpdateRequest("posts", "doc", "1");
        String jsonString = "{" +
                "\"message\":\"updated message\"" +
                "}";
        updateRequest.doc(jsonString, XContentType.JSON);
        UpdateResponse updateResponse = client.update(updateRequest, RequestOp