There are lingering references to the `admin.system.new_users` collection which serve no modern purpose.
This collection was part of the upgrade/downgrade process for MongoDB 2.6 which is long since out of support. https://docs.mongodb.com/manual/release-notes/2.6-downgrade/#downgrade-2-6-user-authorization-model
- causes
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SERVER-83655 Restore legal client ns exception for admin.system.new_users
- Closed