Hello @ruchir_bharadwaj ,
Search nodes are Stateful Set, so the state of your previous installation will be reused for the new one. Have you tried to stop search nodes, dropping persistence volumes for those nodes, and start with the new version? I haven’t experienced that issue, but I think it could happen if you have upgraded Elasticsearch and you are trying to reuse the same data directory.
What’s the strategy for your upgrade? Do you put down all the nodes and then start new one or are you trying to have different versions of SonarQube running at the same time?