db={"your_data":[{"_id":"63636e95422ce851ec25d680","author":{"_id":"6362a7313410b2941a18a559","username":"apple","fullname":"Apple","email":"my-example-email@gmail.com","createdAt":"2022-11-02T17:21:53.092Z","updatedAt":"2022-11-02T17:21:53.092Z"},"content":"hello world, i was born to say goodbye world!","createdAt":"2022-11-03T07:32:37.384Z","updatedAt":"2022-11-03T07:32:37.384Z"}]}

db.your_data.aggregate([{$project:{_id:1,content:1,createdAt:1,updatedAt:1,"author.user_id":"$author._id","author.user_fullname":"$author.username","author.user_email":"$author.email","author.user_updatede":"$author.updatedAt"}}])