ElasticSearch -在Java中创建查询

import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.builder.SearchSourceBuilder;

public class ElasticSearchExample {
    public static void main(String[] args) {
        // 创建ElasticSearch客户端
        RestHighLevelClient client = new RestHighLevelClient();

        // 创建查询请求
        SearchRequest searchRequest = new SearchRequest("index_name");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.matchQuery("field_name", "query_text"));
        searchRequest.source(sourceBuilder);

        try {
            // 执行查询
            SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

            // 处理查询结果
            // ...

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭客户端连接
            try {
                client.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}