Aggregations default field value

I’m trying to generically build up aggregation queries and one thing I need to do is specify a default value of 0 for missing fields on my min,max and average aggregates. In 1.7.1, I don’t see the missing property and when I specify a script I can’t seem to set the value properly.

string defaultValueScript = $"_value != null ? _value : 0";
switch (field.Type) {
  case FieldAggregationType.Average:
    aggregation.Average(field.Key, a => a.Field(field.Field).Script(defaultValueScript));

Any ideas on how to accomplish this while still working once we migrate to 2.x

[niemyjski]

bump

[niemyjski]

But what if you don’t know if it’s a field name or index? In our case it’s user supplied.