Solr does not guarantee backwards compatibility more than one major version back. That is, Solr 3.x is guaranteed to at least read Solr 1.4 indexes (there was no Solr 2.x). Solr 4x can read 3x but not 1.x. Solr 5x can read 4x indexes, but not 3x
You really only have two choices here. You _could_ try to install Solr 3.x and optimize. Then install Solr 4x and optimize. HOpefully this rewrites the entire index to 4.x Then install Solr 5x. You could also try the indexupgrader tool, see: https://lucene.apache.org/core/4_0_0/core/org/apache/lucene/index/IndexUpgrader.html. I'm not sure how many revisions this can "reach back", I.e. if the 4.x index upgrader can read the 1.4, then you're pretty well set, since Solr 5 should be able to read the 4.x format. But what I'd really do is just re-index the corpus if at all possible. The index upgrade process works reasonable well, but there will be some options that have been added, others that have been deprecated in terms of the schema etc. Best, Erick On Thu, Oct 15, 2015 at 8:53 AM, fabigol <fabien.stou...@vialtis.com> wrote: > Hi, > i catch an old project working with Solr 1.4.1, jbossPortal and java 1.5. > I try to migrate my solr version to solr 5.2.1 work with java 1.7. > The solr indexation works but i fail to display the new results on my > application. > I want to know if i must update the jar in my project or if the old version > client (solr-solrj) can work with my new version Solr. > How do i do? > > > > > > -- > View this message in context: > http://lucene.472066.n3.nabble.com/Solr-Migration-1-4-1-5-2-1-tp4234599.html > Sent from the Solr - User mailing list archive at Nabble.com.
