[{"_id":ObjectId("651548277423d019b0c251f6"),"toUsers":[{"createdAt":ISODate("2023-09-28T09:32:23.352Z"),"updatedAt":ISODate("2023-09-28T11:44:00.673Z"),"user":ObjectId("65014c6303b5bf048f627b72"),"visited":true},{"createdAt":ISODate("2023-09-28T09:32:23.352Z"),"updatedAt":ISODate("2023-09-28T09:32:23.352Z"),"user":ObjectId("650167123cc7410860126076"),"visited":false}]},{"_id":ObjectId("6515493994822bf9866ee885"),"toUsers":[{"createdAt":ISODate("2023-09-28T09:36:57.827Z"),"updatedAt":ISODate("2023-09-28T11:18:59.759Z"),"user":ObjectId("65014c6303b5bf048f627b72"),"visited":true},{"createdAt":ISODate("2023-09-28T09:36:57.828Z"),"updatedAt":ISODate("2023-09-28T09:36:57.828Z"),"user":ObjectId("650167123cc7410860126076"),"visited":false}]}]

db.collection.aggregate([{$match:{"_id":ObjectId("651548277423d019b0c251f6")}},{$unwind:"$toUsers"},{$match:{"toUsers.user":ObjectId("650167123cc7410860126076"),"toUsers.visited":false}},{$group:{_id:"$_id",toUsers:{$push:"$toUsers"}}}])