Hello Jacques,
sorry we likely didn't warn clearly enough about this: latest Solr version is still incompatible with Lucene 3; we've been waiting for a long time for a release, but people actually wanted to use Lucene 3 since it's release many months ago so we couldn't wait further.
As we couldn't get any release date estimate from the Solr team, we backported from the Solr trunk the compatibility patches and applied them to the stable branch.
So now you shouldn't use any official Apache Solr release but use the new
hibernate-search-analyzers package, which contains this special edition of Solr. We didn't change any package name, and all changes are kept to the minimum possible: so it's very similar to latest Solr, just compatible so that people can avoid the problem you just reported.
Code:
<groupId>org.hibernate</groupId>
<artifactId>hibernate-search-analyzers</artifactId>
I see there's no explanation of this on the documentation - we hoped up to last second to be able to remove this device; opening a JIRA for proper documentation.