Yes, if the replacing similarity has a different implementation on norms, you should reindex or gradually update all documents within decent time.
-----Original message----- > From:Ahmet Arslan <iori...@yahoo.com.INVALID> > Sent: Thursday 9th October 2014 18:27 > To: solr-user@lucene.apache.org > Subject: Re: does one need to reindex when changing similarity class > > How about SweetSpotSimilarity? Length norm is saved at index time? > > > > On Thursday, October 9, 2014 5:44 PM, Jack Krupansky > <j...@basetechnology.com> wrote: > The similarity class is only invoked at query time, so it doesn't > participate in indexing. > > -- Jack Krupansky > > > > > -----Original Message----- > From: Markus Jelsma > Sent: Thursday, October 9, 2014 6:59 AM > To: solr-user@lucene.apache.org > Subject: RE: does one need to reindex when changing similarity class > > Hi - no you don't have to, although maybe if you changed on how norms are > encoded. > Markus > > > > -----Original message----- > > From:elisabeth benoit <elisaelisael...@gmail.com> > > Sent: Thursday 9th October 2014 12:26 > > To: solr-user@lucene.apache.org > > Subject: does one need to reindex when changing similarity class > > > > I've read somewhere that we do have to reindex when changing similarity > > class. Is that right? > > > > Thanks again, > > Elisabeth > > >