[{_id:"5f1690a8d15ff6558cb48cc1",content:{_id:"5f1690a7d15ff6558cb48cc0",creator:{_id:"5f166ce0c6b1744fee6b28e7"},__v:0,}}]

db.collection.find({"content.creator._id":"5f166ce0c6b1744fee6b28e7"})