UiPath older robot logs/indices not appearing after upgrade

Due to the unavoidable vulnerability on log4j, we upgraded our Elasticsearch to 7.16.x. After the upgrade, the old uipath robot logs were not visible. Only the current executions of the robot logs were visible. Can someone advise what should be correct way to upgrade Elasticsearch?

Note: We have a single node setup , and uipath robot logs are being pushed to both ES and Database.

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