reactivemongo.api.commands.GroupAggregation
Represents one of the group/accumulator operators, for the $group aggregation. Operation.
$group
https://docs.mongodb.com/manual/reference/operator/aggregation/group/#accumulator-operator
Represents one of the group/accumulator operators, for the
$group
aggregation. Operation.https://docs.mongodb.com/manual/reference/operator/aggregation/group/#accumulator-operator