[{"_id":"637cbf94b4741277c3b53c6c","text":"outter","username":"test1","address":[{"text":"inner","username":"test2","_id":"637cbf94b4741277c3b53c6e"}],"__v":0}]

db.collection.find({_id:"637cbf94b4741277c3b53c6c"},{address:{$eq:{_id:"637cbf94b4741277c3b53c6e"}}})