reactivemongo.api.commands.GroupAggregation
Since MongoDB 3.4
The fields to include. The resulting objects will also contain these fields.
https://docs.mongodb.com/manual/reference/operator/aggregation/addFields/
The fields to include.
Since MongoDB 3.4
The fields to include. The resulting objects will also contain these fields.
https://docs.mongodb.com/manual/reference/operator/aggregation/addFields/