Math.round in painless script

Elastic Stack Elasticsearch
2

Not sure I understand, Math.round() requires a float/double as an argument, but returns a long. However the aggregation result will be casted to a float again, if that's what you mean. See this example, of avering two longs

DELETE test

PUT test/_doc/1
{
  "key" : 10
}

PUT test/_doc/2
{
  "key" : 20
}

GET test/_search
{
  "size": 0,
  "aggs": {
    "avg": {
      "avg": {
        "field": "key"
      }
    }
  }
}

Is this what you mean with still getting a float? If so, the float should still be the correct value.