SQL: COUNT(DISTINCT [field_name]) generates "Two sibling aggregations cannot have the same name" error

[astefan]

Test index mapping with no documents:

PUT ip_index2
{
  "mappings": {
    "_doc": {
      "properties": {
        "source": {
          "type":"text",
          "fields": {
            "keyword": {
              "type":"keyword"
            }
          }
        },
        "country": {
          "type": "keyword"
        }
      }
    }
  }
}

The following query select source,count(distinct country) from ip_index2 group by source having count(distinct country)>5 generates an error:

Server error [Server sent bad type [illegal_argument_exception]. Original type was [Two sibling aggregations cannot have the same name: [1777]]. [java.lang.IllegalArgumentException: Two sibling aggregations cannot have the same name: [1777]

[elasticmachine]

Pinging @elastic/es-search-aggs

[alexfrancoeur]

I've run into this with queries in Canvas as well

SELECT FLOOR(SUM(FlightTimeMin)/1440) as total_days, (365-(FLOOR(SUM(FlightTimeMin)/1440))) as "days_leftover"
FROM kibana_sample_data_flights