Currently the option of "security.TransitionToAuth" is not available in Ops Manager as "transitionToAuth" is automatically added to each node in a rolling fashion by the Automation agent and then ultimately removed when authentication is finally turned on for all nodes.

Allowing this option through Ops Manager will enable the mongod to accept and create authenticated and non-authenticated connections to and from the connected clients. Thus the clients can use this feature to avoid downtime at their end while the connection settings are updated to use the appropriate user to connect to mongod.