Hi All, Since 2015 we are using Solr cloud for search. We are using Solr 5.2.1 now we want to upgrade Solr 5.2.1 to Solr 7.7.2. Along with Solr we are using Zookeeper 3.4.6 and wanted to upgrade it to Zookeeper 3.4.10. We have huge data stored in existing Solr and need to maintained while migrating to Solr 7.7.1.
We have installed Solr 5.2.1 & Zookeeper 3.4.6 on windows server, for installation we have used NSSM tools. We have installed 3 Zookeeper on 3 instances , 6 shards and 9 solr nodes on 3 different instances. Can you please share procedure to upgrade Solr 5.2.1 to Solr 7.7.2 on windows without affecting existing solr data (want to maintained)? Thanks, Yogesh Chaudhari