Running mongorestore --drop will not actually clear out the contents of admin.system.roles because you can't call drop on system collections. admin.system.users is special cased to use remove() to clear out the old users, we should do something similar with admin.system.roles and admin.system.version.
- related to
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SERVER-12369 Update mongodump and mongorestore to properly handle backing up users and roles in 2.6
- Closed
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SERVER-10493 Update tools to support backing up and restoring user data properly with new user format 2.6
- Closed