[{"id":2,"Name":"CHK-MG-3","NumberOfWorkbenches":170,"AllocatedWorkbenches":0,"Benchbetails":[{"seatRowLabel":"A","IsRowspace":false,"seats":[{"key":"A_1","status":"available","BenchName":"","IsAllocated":true,"IsRequested":false,"seatNo":"","seatLabel":"","dir":"","labelNo":"x12","team":"","AllocationData":[{"id":111,"Program":"STL","Duration":"3 days","Team":"Frankestein"}]}]}]}]

db.collection.update({"Name":"CHK-MG-3","Benchbetails.seats.labelNo":"x12"},{"$set":{"Benchbetails.$[bench].seats.$[seat].IsAllocated":false,"Benchbetails.$[bench].seats.$[seat].AllocationData":null}},{"arrayFilters":[{"bench.seats.labelNo":"x12"},{"seat.labelNo":"x12"}]})