尝试使用GET API通过elasticsearch和JAVA API检索单个术语

import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
import org.elasticsearch.search.lookup.SourceLookup;

import java.io.IOException;

public class ElasticsearchGetAPIExample {
    public static void main(String[] args) {
        // 创建RestHighLevelClient实例
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http")));

        // 构建GetRequest对象
        GetRequest getRequest = new GetRequest("your_index", "your_type", "your_id");

        // 可选：设置检索的源字段
        String[] includes = Strings.EMPTY_ARRAY;
        String[] excludes = new String[]{"field_to_exclude"};
        FetchSourceContext fetchSourceContext =
                new FetchSourceContext(true, includes, excludes);
        getRequest.fetchSourceContext(fetchSourceContext);

        // 可选：设置检索超时时间
        getRequest.timeout(TimeValue.timeValueSeconds(1));

        try {
            // 执行检索请求
            GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);

            // 处理检索结果
            if (getResponse.isExists()) {
                String sourceAsString = getResponse.getSourceAsString();
                System.out.println("检索结果：" + sourceAsString);
            } else {
                System.out.println("未找到指定文档");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        // 关闭RestHighLevelClient连接
        try {
            client.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}