The page talking about balancing modes should specify that currently we only support "full" and "off" modes. Any other mode will be ignored and be equivalent to balancer "off".

Description of Linked Ticket

The autoSplitOnly balancer configuration is currently technically equivalent to balancing off. It is still present in order to avoid breaking balancer settings parsing.

Proposed solution 1:

• Write an upgrade procedure that changes the persisted autoSplitOnly value to off
• Get rid of the autoSplitOnly mode

Proposed solution 2:

• Get rid of the autoSplitOnly mode
• Ignore parsing errors: if an unknown mode is set, balancer mode is considered off. And a warning must be logged when an invalid mode is set.