[{"name":"John","state":"CA","people":[{"id":"1","qty":"5","type":"3"},{"id":"4","qty":"5","type":"6"}]},{"name":"Katie","state":"NY","people":[{"id":"434","qty":"5","type":"63"},{"id":"34","qty":"6","type":"21"}]}]

db.collection.aggregate([{"$unwind":{"path":"$people"}},{"$match":{"people.qty":"5"}},{"$project":{"_id":0,"name":1,"id":"$people.id","qty":"$people.qty"}}])