Aggregations are not working in ES when doc_values=false

[Yamuna_Mallikarjun]

Hello,

1. Initially we were using ES 2.4.1 and doc_values=false for long datatype:
   and Aggregations were fine with the below configuration.
   "ts": {
   "norms": {
   "enabled": false
   },
   "index": "not_analyzed",
   "type": "long",
   "doc_values":false
   }
2. Upgraded ES version to 6.6.0 and Aggregations are not working with the below configurations :
   "ts": {
   "type": "long",
   "doc_values":false
   }

When we saw field data says its disabled on text field but not for long. Why aggregations are not working then.

Thanks