Hello, my ES cluster is still running version 0.20.1. It is time to upgrade. I know I cannot just use indexes as is and replace the jars by the newest ES. They are not compatible as far as I understood. So I need to set up a parallel cluster with the newest ES and some how transfer all the data…

Upgrading from very old version of ES with zero down time

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Upgrading from very old version of ES with zero down time

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