如何在elasticsearch 6.1.1 java api中按别名查找索引

import org.apache.http.HttpHost;
import org.elasticsearch.action.admin.indices.alias.get.GetAliasesRequest;
import org.elasticsearch.action.admin.indices.alias.get.GetAliasesResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.cluster.metadata.AliasMetadata;

import java.io.IOException;
import java.util.Map;
import java.util.Set;

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

        try {
            GetAliasesRequest request = new GetAliasesRequest("your_alias");
            GetAliasesResponse response = client.indices().getAlias(request, RequestOptions.DEFAULT);

            Map<String, Set<AliasMetadata>> aliases = response.getAliases();
            Set<String> indices = aliases.keySet();

            System.out.println("Indices associated with alias:");
            for (String index : indices) {
                System.out.println(index);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            client.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}