At first I thought you were referring to Filters in Lucene at query time (i.e. bitset filters) but I think you are referring to token filters at indexing/text analysis time?
I have had success writing my own Filter as the link presents. The key is that you should write a custom class that extends TokenFilter ( http://lucene.apache.org/core/4_1_0/core/org/apache/lucene/analysis/TokenFilter.html) and write the implementation in your incrementToken() method. My recollection of this is that instead of returning something of a Token like you would have in earlier versions of Lucene, you set attribute values on a notional "current" token. One obvious attribute is the term text itself and perhaps any positional information. The best place to start is to pick a fairly simple example from the Solr Source (maybe lowercasefilter) and try and mimic that. Cheers! Amit On Mon, May 13, 2013 at 1:33 PM, Jonathan Rochkind <rochk...@jhu.edu> wrote: > Does anyone know of any tutorials, basic examples, and/or documentation on > writing your own Filter plugin for Solr? For Solr 4.x/4.3? > > I would like a Solr 4.3 version of the normalization filters found here > for Solr 1.4: > https://github.com/billdueber/**lib.umich.edu-solr-stuff<https://github.com/billdueber/lib.umich.edu-solr-stuff> > > But those are old, for Solr 1.4. > > Does anyone have any hints for writing a simple substitution Filter for > Solr 4.x? Or, does a simple sourcecode example exist anywhere? >
