Value count aggregation

Value count aggregation # A single-value metrics aggregation that counts the number of values that are extracted from the aggregated documents. Typically, this aggregator will be used in conjunction with other single-value aggregations. For example, when computing the avg one might be interested in the number of values the average is computed over. value_count does not de-duplicate values, so even if a field has duplicates each value will be counted individually. ...