如何通过Java wrapper在IBM Watson Retrieve And Rank API中执行searchAndRank方法

import com.ibm.watson.retrieve_and_rank.v1.RetrieveAndRank;
import com.ibm.watson.retrieve_and_rank.v1.model.RankerOutput;
import com.ibm.watson.retrieve_and_rank.v1.model.RankerOutputList;

public class WatsonRetrieveAndRankExample {
    private static final String API_KEY = "YOUR_API_KEY";
    private static final String URL = "YOUR_SERVICE_URL";
    private static final String CLUSTER_ID = "YOUR_CLUSTER_ID";
    private static final String RANKER_ID = "YOUR_RANKER_ID";

    public static void main(String[] args) {
        RetrieveAndRank service = new RetrieveAndRank(API_KEY, URL);

        // 设置要搜索的索引
        String indexName = "YOUR_INDEX_NAME";

        // 设置查询字符串
        String query = "YOUR_QUERY";

        // 设置其他可选参数
        int numResults = 10;
        String[] returnFields = {"field1", "field2"};

        // 调用searchAndRank方法
        RankerOutputList response = service.searchAndRank(CLUSTER_ID, RANKER_ID, indexName, query, numResults, returnFields).execute();

        // 解析响应对象
        if (response.getStatusCode() == 200) {
            RankerOutput[] results = response.getResults();
            for (RankerOutput result : results) {
                // 处理搜索结果
                System.out.println(result.toString());
            }
        } else {
            System.out.println("Search failed. Status code: " + response.getStatusCode());
        }
    }
}