No there is no support for a full cluster restart in the ECK operator. Why do you want to do a full cluster restart? There should be under normal circumstances no reason to do that. There are however exceptional circumstances where it might be necessary to restart individual Elasticsearch nodes for example if you are running into a bug in Elasticsearch or something of that sort. In such cases you can force restart a node by just deleting the corresponding Pod. The operator or more precisely the StatefulSet controller will immediately recreate it.
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