migration: mongodb article has no `created_by` field.
migration: mongodb article has no `created_by` field.

WillianPaiva/1flow,WillianPaiva/1flow,1flow/1flow,1flow/1flow,WillianPaiva/1flow,1flow/1flow,WillianPaiva/1flow,1flow/1flow,1flow/1flow,WillianPaiva/1flow