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While it made sense to have an "auto split only" mode when the auto-splitter existed (pre-v6.0.3) on shards to keep chunks of similar sizes, it does not make much sense to have an "auto merge only": if the balancer is not working, then there are no chunks to merge. While if a user is manually balancing, can also manually call mergeAllChunksOnShard.
Purpose of this ticket is to remove the auto merge only mode (that has never been released yet nor properly plugged in the balancer).
The following settings will be considered in order of precedence by the balancer:
- Global balancing
- Balancing window
- Per-collection balancing
- Global automerge
- Per-collection automerge
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