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With the new config, the leader election decision will be made in the following order when the current leader is fenced or the last ELR member registers with unclean shutdownISR and ELR meets the requirements:

1. If there are other ISR members, choose an ISR member.

2. If there are unfenced ELR members, choose an ELR member.

3. If there are fenced ELR members

   1. If the unclean.recovery.strategy=Proactive, then an unclean recovery will happen.

   2. Otherwise, we will wait for the fenced ELR members to be unfenced.

4. If there are no ELR members.

   1. If the unclean.recovery.strategy=Proactive, the controller will do the unclean recovery.

   2. If the unclean.recovery.strategy=Balanced, the controller will do the unclean recovery when all the LastKnownELR are unfenced. See the following section for the explanations.

   3. Otherwise, unclean.recovery.strategy=Manual, the controller will not attempt to elect a leader. Waiting for the user operations.

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