[{"type":"admin","mobileNumber":1,"email":"e@e.com"},{"type":"individual","mobileNumber":2,"email":"a@a.com"}]

db.collection.find({},{"_id":0,"type":1,"email":{"$cond":[{"$eq":["$type","admin"]},"$email","$$REMOVE"]},"mobileNumber":{"$cond":[{"$eq":["$type","admin"]},"$mobileNumber","$$REMOVE"]}})