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ElasticSearch Error: Invalid term-aggregator order path [_key]. Unknown aggregation [_key] while performing aggregation from Java

i'm getting the below error when performing aggregation Error: Invalid term-aggregator order path [_key]. Unknown aggregation [_key] while performing aggregation from Java

code :

 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()
Error:
{"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}
when I run from curl i'm getting the output sucessfully.
Curl:
curl -v -X GET "https://hostname/_search?pretty" -H 'Content-Type: application/json' -d 
'{"aggs" : { "products" : { 
   "terms" : {"field" : "myField.keyword","size" : 5}
Not sure what is the mistake whether it is the issue with the ElasticSearch java package or i'm doing some mistake.
I'm using Jest-5.x and elasticsearch 7.4.2
Please suggest other alternatives
I have the same problem
The problem is the incompatibility of Elasticsearch library 5 and 6 and above.
Problems like 'auto_generate_synonyms_phrase_query' and '_key' and '_doc'.
Elasticsearch version 7 library does not support Elasticsearch version 5.
You must version org.elasticsearch :
      <dependency>
          <groupId>org.elasticsearch</groupId>
          <artifactId>elasticsearch</artifactId>
          <version>7.*.*</version>
      </dependency>
Change to versions 5:
      <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>5.*.*</version>
      </dependency>
        
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