Average over buckets doc_count

[Demetrius Nunes]

Hi there,

Is there a way to calculate the average over the doc_count result of a 
bucket aggregation?

For instance, I have this aggregation query:

GET channel/Subscription/_search
{
  "size": 1, 
  "aggs": {
    "SubscriptionsPerUser": {
      "terms": {
        "field": "UserId",
        "min_doc_count": 0,
        "size": 1000
      }
    }
  }
}

I would like to calculate the average doc_count for each resulting bucket, 
which would give me the average subscriptions/user metric.

Thanks,
Demetrius

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