Personally I always do a full reindex when going to a new version, just safer and you should always be able to do such at any point. However if you got the time to spare you can do an optimize and it will force the segments all into the current version
> On Oct 6, 2021, at 8:46 AM, Michael Conrad <mich...@newsrx.com> wrote: > > Hello all, > > Is there an easy way to determine Lucene versions for segments? > > If we were to do a full reindex, rewriting all segments, would that update > the segment version to match the current Lucene version in use? > > We are working on upgrading from Solr 7.7.3 to Solr 8.x but have discovered > that several of our collections have segments that are Lucene 6. > > -Mike
