[7.x] Default index.shard.check_on_startup to false for searchable snapshots #74279
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Today a searchable snapshot index inherits the
index.shard.check_on_startup index setting from
the snapshot it is mounted from. But this setting
can require some expensive processing as
documented in #74233, so we decided in #73147
to default the value of this setting to false but
allow the user to override this in the mount request.
Backport of #74235
Closes #73147