Add ScriptFile parameter for NEST MetricAggregator

[orenasaf]

Elastic.Net version 1.91

public abstract class MetricAggregator : IMetricAggregator
{
  public PropertyPathMarker Field { get; set; }

  public string Script { get; set; }

  public IDictionary<string, object> Params { get; set; }

  public string Language { get; set; }
 }

Missing a property that will map to script_file

[russcam]

Thanks for reporting @orenasaf.

[russcam]

I've opened PR #2529 to fix this

[russcam]

@orenasaf , these are now in NEST 1.9.2.

Closing this.