Lucene Plugin

Hello! I am trying to add the lucene plugin http://www.xwiki.org/xwiki/bin/view/Dev/XWikiLucenePlugin to my 0.9.1252 XWiki install, but only ever get "No Results". My boss wants pdf/excel/word search capabilites. I followed the instructions and also had it once running on a 0.840. Lucene now seems not to return any results. Is the plugin compatible with the new versions? Are changes in XWIKI the reason or could it be that I use the Jetty windows version? Thanks and Regards, Sascha