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 

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)?


Yogesh Chaudhari

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