On 2/16/23 11:25, Paul, Lulu wrote:
Please may I ask for some advice regarding upgrading the SOLR version (ours currently running on solr-5.2.1) to the latest version? Looking at incremental version upgrade (from the SOLR Upgrade notes I was hoping to move up to 6.x), But also wanted to know if moving directly to 8.x or 9.x is a possiblility?
You can't do it without a full reindex. Solr/Lucene 8.x will refuse to open an index that has EVER been touched by a Solr version before 7.0, so you can't do it even if you do an upgrade one major version at a time. Version 9.x does the same with indexes touched by a version earlier than 8.0.
A full reindex with ANY version upgrade is strongly recommended, even if the new version can use the old index.
Thanks, Shawn
