Database
[{user:222,status:"active",isInFlux:true},{user:234,status:"active",isInFlux:false},{user:234,status:"active",isInFlux:true},{user:111,status:"active",isInFlux:true},{user:111,status:"active",isInFlux:true}]
Query
db.collection.aggregate([{"$group":{"_id":"$user","orders":{"$push":{"$cond":[{$and:[{"$eq":["$isInFlux",true]},{"$eq":["$status","active"]}]},"$$ROOT","$$REMOVE"]}}}}])