Rolling upgrade
When upgrading to Elasticsearch 8.0 and later, you must first upgrade to 7.17 whether you opt to perform a rolling upgrade (upgrade one node at a time) or a full-cluster restart upgrade. For more information about upgrading, refer to Upgrading to Elastic 8.17.3.
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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/rolling-upgrades.html
