Allow to migrate partitions to leaders with same leader epoch or NULL leader epoch #4901
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Closes: Not switching to a leader without leader epochs while doing a cluster roll to upgrade the cluster #4796.
Fix to allow to migrate partitions to leaders with NULL leader epoch.
NULL leader epoch can happen during a cluster roll with an upgrade to a
version supporting KIP-320.
Happening since v2.1.0
Closes: Fail to recover a partition which was temporarily delegated to the internal broker #4804.
Fix to allow to migrate partitions to leaders with same leader epoch.
Same leader epoch can happen when partition is
temporarily migrated to the internal broker (Fail to recover a partition which was temporarily delegated to the internal broker #4804), or if broker implementation
never bumps it, as it's not needed to validate the offsets.
Happening since v2.4.0