[Backport 7.x] Detect when security index is closed #42740
Merged
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If the security index is closed, it should be treated as unavailable
for security purposes.
Prior to 8.0 (or in a mixed cluster) a closed security index has
no routing data, which would cause a NPE in the cluster change
handler, and the index state would not be updated correctly.
This commit fixese that problem
Backport of: #42191