[{"apikey":1,"meta":{"region":{"country":"India","city":"bangalore","pincode":560067},"address":{"houseNo":"G/C 42 Whitefield boulavourd","landmark":"whitefield boulavourd"}}},{"apikey":2,"meta":{"region":{"country":"Germaany","city":"Munich","pincode":80297},"address":{"houseNo":"Zweibrückenstraße 12","landmark":"Zweibrückenstraße 12"}}}]

db.collection.find({apikey:2},{"_id":1,"apikey":"$apikey","region":"$meta.region"})