[{"name":"Apples","qty":120,"from":["USA","Brazil","Russia"],"contractors":[{"name":{"fname":"Sam","lname":"McGregor"},"age":22},{"name":{"fname":"zxc","lname":"asd"},"age":32}]}]

db.collection.find({"contractors":{$elemMatch:{"name.fname":"Sam","name.lname":"McGregor"}}},{"contractors.age.$":1,"_id":0})