On Thu, Oct 28, 2010 at 4:44 PM, <johnmu...@aol.com> wrote: > > I'm using Solr 1.2. If I upgrade to 1.4.1, must I re-index because of > LUCENE-1142? If so, how will this affect me if I don’t re-index (I'm using > EnglishPorterFilterFactory)? What about when I’m using non-English stammers > from Snowball? > > Beside the brief note "IMPORTANT UPGRADE NOTE" about this in CHANGES.txt, > where can I read more about this? I looked in JIRA, LUCENE-1142, there isn't > much.
I haven't looked in detail regarding these changes, but the snowball was upgraded to revision 500 here. you can see the revisions/logs of the various algorithms here: http://svn.tartarus.org/snowball/trunk/snowball/algorithms/?pathrev=500 One problem being, i don't know the previous revision you were using...but since it had no Hungarian before LUCENE-1142, it couldnt have possibly been any *later* than revision 385: Revision 385 - Directory Listing Added Mon Sep 4 14:06:56 2006 UTC (4 years, 1 month ago) by martin New Hungarian stemmer This means, for example, that you would certainly be affected by changes in the english stemmer such as revision 414, among others: Revision 414 - Directory Listing Modified Mon Nov 20 10:49:29 2006 UTC (3 years, 11 months ago) by martin 'arsen' as exceptional p1 position, to prevent 'arsenic' and 'arsenal' conflating In my opinion, it would be best to re-index.
