[{_id:ObjectId("641b5665894f755f6dc422a2"),qty:2,directMsgs:{person1:[{authorId:ObjectId("6454bb4e33b90133ba752e96"),isRead:false},{authorId:ObjectId("641b5665894f755f6dc422a2"),isRead:true}],person2:[{authorId:ObjectId("641b5665894f755f6dc422a2"),isRead:true},{authorId:ObjectId("642b5765834f755f6dc422b3"),isRead:true}]}}]

db.collection.aggregate([{$project:{directMsgs:{$objectToArray:"$directMsgs"}}},{$match:{$expr:{$and:[{_id:ObjectId("641b5665894f755f6dc422a2")/** uid*/},{$ne:[{$filter:{input:{$reduce:{input:"$directMsgs.v",initialValue:[],in:{$concatArrays:["$$value","$$this"]}}},cond:{$and:[{$ne:["$$this.authorId",ObjectId("641b5665894f755f6dc422a2")/** uid*/]},{$eq:["$$this.isRead",false]}]}}},[]]}]}}}])