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 with zero down time. The size of the indexes is about 100Gb and the traffic is relatively big, so it could take some time, and somehow I need to keep the clusters in sync. Did someone had such experience? Does someone have any suggestions how to approach this? I cannot come up with some elegant solution. Any help is greatly appreciated. Thank you, Eugene
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