public TokenStream create(TokenStream tokenStream) {
if (version.onOrAfter(Version.LUCENE_4_4)) {
return new KeepWordFilter(tokenStream, keepWords);
} else {
@SuppressWarnings("deprecated")
final TokenStream filter = new Lucene43KeepWordFilter(enablePositionIncrements, tokenStream, keepWords);
return filter;
}
}