执行聚合错误时，我收到以下错误：无效的术语聚合器顺序路径[_key]。从Java执行聚合时未知的聚合[_key]

代码：

public static void main(String[] args){

 JestClient jestClient = getJestClient();

 SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
 searchSourceBuilder.size(100);
 searchSourceBuilder.aggregation(AggregationBuilders.terms("products").field("myField.keyword").
 valueType(ValueType.STRING).size(100));

 SearchRequest searchRequest = new SearchRequest(); 
 searchRequest.source(searchSourceBuilder);
 Search searchQuery = new Search.Builder(searchSourceBuilder.toString()).
setParameter(Parameters.SCROLL,"5m").setSearchType(SearchType.DFS_QUERY_THEN_FETCH).build();
JestResult hits = jestClient.execute(searchQuery);
System.out.println(hits.getJsonObject);
}

public static void getJestClient(){
JestClientFactory factory = new JestClientFactory();
        factory.setHttpClientConfig(
                new HttpClientConfig.Builder(hostname)
                        .multiThreaded(true)
                        .readTimeout(30000)
                        .build());
        return factory.getObject()
}

错误：

{"error":{"root_cause":[{"type":"aggregation_execution_exception","reason":"Invalid term- 
aggregator order path [_key]. Unknown aggregation [ . 
  _key]"}],"type":"search_phase_execution_exception","reason":"all shards 
 failed","phase":"dfs_query","grouped":true,"failed_shards": 
[{"shard":0,"index":".kibana","node":"RwVYV0S-SVmiqfMuihkcHA","reason": 
{"type":"aggregation_execution_exception","reason":"Invalid term-aggregator order path 
 [_key]. Unknown aggregation [_key]"}}]},"status":500}

• 当我从cURL运行时，我成功地获得了输出。*

curl：

curl -v -X GET "https://hostname/_search?pretty" -H 'Content-Type: application/json' -d 
'{"aggs" : { "products" : { 
   "terms" : {"field" : "myField.keyword","size" : 5}
}}}'

不确定是什么错误，是ElasticSearch Java包的问题，还是我做错了什么。

我正在使用Jest-5.x和elasticsearch 7.4.2

请推荐其他替代方案