Fix Rollover error when alias has closed indices #47839
Merged
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Rollover previously requested index stats for all indices in the
provided alias, which causes an exception when there is a closed index
with that alias.
This commit adjusts the IndicesOptions used on the index stats
request so that closed indices are ignored, rather than throwing
an exception.
This is mostly a backport of #47148, but the behavior is slightly
different: If the write index is closed, rollover will throw an
exception, as 6.8 cannot retrieve index stats for closed indices.