Nhat Nguyen 416e51980c Relax ShardFollowTasksExecutor validation (#60054)
If a primary shard of a follower index is being relocated, then we
will fail to create a follow-task. This validation is too restricted.
We should ensure that all primaries of the follower index are active
instead.

Closes #59625
2020-07-28 13:46:49 -04:00
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