【elastic search】JAVA操作elastic search

以下是一个使用Java High Level REST Client操作Elasticsearch的基本示例，包括创建索引、添加文档、搜索文档的代码。

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.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 ElasticSearchExample {
 
    public static void main(String[] args) throws IOException {
        // 初始化RestHighLevelClient
        RestClientBuilder builder = RestClient.builder(new HttpHost("localhost", 9200, "http"));
        RestHighLevelClient client = new RestHighLevelClient(builder);
 
        // 创建索引
        createIndex(client);
 
        // 添加文档
        indexDocument(client, "1", "{\"name\":\"John Doe\"}");
 
        // 搜索文档
        searchDocument(client, "John");
 
        // 关闭客户端
        client.close();
    }
 
    private static void createIndex(RestHighLevelClient client) throws IOException {
        // 使用High Level REST Client创建索引
        CreateIndexRequest request = new CreateIndexRequest("my_index");
        CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);
        System.out.println("索引创建状态: " + createIndexResponse.isAcknowledged());
    }
 
    private static void indexDocument(RestHighLevelClient client, String id, String jsonString) throws IOException {
        // 使用High Level REST Client索引文档
        IndexRequest indexRequest = new IndexRequest("my_index");
        indexRequest.id(id);
        indexRequest.source(jsonString, XContentType.JSON);
        IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
        System.out.println("文档索引状态: " + indexResponse.status());
    }
 
    private static void searchDocument(RestHighLevelClient client, String searchText) throws IOException {
        // 使用High Level REST Client搜索文档
        SearchRequest searchRequest = new SearchRequest("my_index");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder