[{_id:"6086b8eec1f5325278846983",user_id:"13",car_name:"Car name 1",parts:[{part_id:"P456",part_name:"Part name 1",image:"image url",stats:{price:10,}},{part_id:"P905",part_name:"Part name 2",image:"image url",stats:{price:15,}}]}]

db.collection.aggregate([{$match:{"user_id":"13","parts.part_id":"P456"}},{$unwind:"$parts"},{$match:{"parts.part_id":"P456"}}])