On 2/21/23 04:30, Lulu Paul 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?
Did you see my reply when you asked the same question on February 16th?
Here it is again:
---
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.
---
An additional note that I thought of since that time: I have seen a
tool that bypasses that version check and allows the VERY NOT
RECOMMENDED version-by-version upgrade to work across more than one
major version jump. Don't try it. Re-index from scratch, you'll get
much better results.
Thanks,
Shawn
