How can I use the es client to query crateDB

I wanna query crateDB through ES client.But failed

I set the es.api.enabled: true in the crate.yml and I used the ES java-rest-high-level-client to connect crateDB via port 4200, but I cannot get any response

public class crateAPI {
    public static void main(String[] args) throws Exception{
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("localhost", 4200, "http")));
        SearchRequest searchRequest =new SearchRequest();
        SearchSourceBuilder searchSourceBuilder =new SearchSourceBuilder(); 
        searchSourceBuilder.query
                     (QueryBuilders.termQuery("test.news.content","test"));
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest);
        for(SearchHit hit : searchResponse.getHits().getHits()){
            System.out.println(hit.getSourceAsString());
        }
        client.close();
    }
}

You probably shouldn't (and soon be deprecated) as advised in their official documentation here

But if you have to in the mean time, Crate will respond to a standard ES URL search like so

http://your-server:4200/*your-index-name*/_search?q=your-field:your-search-value