We are trying to upgrade solr version 7.7.3 to 9.1.1; for this do we have to run IndexUpgrader Tool before upgrading to next major version(i.e 7x to 8x) or after upgrading to 8x, we have to run this 7x utility to reindex the documents?
What's the recommended approach to upgrading Solr from version 7.7.3 to 9.1.1 using the IndexUpgrader tool?
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I have upgraded from 7.5 to 8.11 successfully. A direct upgreade from 7.x to 9.x may be risky as a lot has changed in 9.x. I would recommend upgrade from 7.x to 8.x and then from 8.x to 9.x. Please go through relevant Solr documentation here https://solr.apache.org/guide/solr/latest/upgrade-notes/major-changes-in-solr-9.html
So here are the general steps You need to upgrade Zookeeper and Solr a compatible version of your target Solr General steps
Before Upgrade
Upgrade Solr - https://solr.apache.org/guide/8_11/upgrading-a-solr-cluster.html
General steps
At this time you should have an index properly upgraded to 8.11 You may want to separately upgrade Zookeeper too to a compatible version (3.6.x)
Steps for Zookeeper upgrade
Repeat the steps above for 8.x to 9.x, but do remember to draft your own run book after thorough reading of the links provided. As usual test this on dev environment before doing in production