anchor.diff:          "metrics": {
             "m": 2.718280076980591,
             "i": -12,
  -          "d": "2019-12-31T00:12:12.000Z"
  +          "d": "2019-12-31T00:12:12.000Z",
  +          "t.keyword": "chicken"
           }
         } ]
       }
  
positive.code:         "metrics": [
            {"field": "m"},
            {"field": "i"},
            {"field": "d"}
          ],
          "sort": {"s": "desc"}
        }
  
negative.code: }
  POST /test/_bulk?refresh
  {"index": {}}
  {"s": 1, "m": 3.1415, "i": 1, "d": "2020-01-01T00:12:12Z", "t": "cat"}
  {"index": {}}
  {"s": 2, "m": 1.0, "i": 6, "d": "2020-01-02T00:12:12Z", "t": "dog"}
  {"index": {}}
  {"s": 3, "m": 2.71828, "i": -12, "d": "2019-12-31T00:12:12Z", "t": "chicken"}
  POST /test/_search?filter_path=aggregations
  {
    "aggs": {
  