main cron Tolerate the elasticsearch-ruby v8 client in integration tes…
* elasticsearch-ruby client got updated to v8 in LS core. This plugin uses it in integration tests. This change tolerates both elasticsearch-ruby v7 and v8 client versions.
* Fix the ILM spec issue where method was removed, restored internally.
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Co-authored-by: João Duarte <jsvduarte@gmail.com>
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