Alias of group key is not returned correctly

[Jianfei-Li]

Query 1:

SELECT Dest es-table.Dest, COUNT(*) count, COUNT(DistanceKilometers) es-table.DistanceKilometers_count
  FROM kibana_sample_data_flights
  GROUP BY Dest
  ORDER BY Dest DESC
  LIMIT 2

The return is as below, in which the aggregation key returned is Dest instead of es-table.Dest

{
  "took": 3,
  "timed_out": false,
  "_shards": {
    "total": 1,
    "successful": 1,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 10000,
      "relation": "gte"
    },
    "max_score": null,
    "hits": []
  },
  "aggregations": {
    "Dest": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 11842,
      "buckets": [
        {
          "key": "Zurich Airport",
          "doc_count": 691,
          "es-table.DistanceKilometers_count": {
            "value": 691
          },
          "count": {
            "value": 691
          }
        },
        {
          "key": "Xi'an Xianyang International Airport",
          "doc_count": 526,
          "es-table.DistanceKilometers_count": {
            "value": 526
          },
          "count": {
            "value": 526
          }
        }
      ]
    }
  }
}

Query 2:

SELECT date_format(timestamp, 'yyyy-MM') es-table.timestamp_tg, COUNT(*) count, COUNT(DistanceKilometers) es-table.DistanceKilometers_count
FROM kibana_sample_data_flights
GROUP BY date_format(timestamp, 'yyyy-MM')
ORDER BY date_format(timestamp, 'yyyy-MM') DESC
LIMIT 2500

The response is as below, in which the aggregation key returned is date_format_4 instead of the alias(es-table.timestamp_tg)

{
  "took": 145,
  "timed_out": false,
  "_shards": {
    "total": 1,
    "successful": 1,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 10000,
      "relation": "gte"
    },
    "max_score": null,
    "hits": []
  },
  "aggregations": {
    "date_format_4": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "2019-10",
          "doc_count": 6201,
          "es-table.DistanceKilometers_count": {
            "value": 6201
          },
          "count": {
            "value": 6201
          }
        },
        {
          "key": "2019-09",
          "doc_count": 6858,
          "es-table.DistanceKilometers_count": {
            "value": 6858
          },
          "count": {
            "value": 6858
          }
        }
      ]
    }
  }
}

[galkk]

Aliases are issue in general, see #117 as well