* StandardFilter, LowerCaseFilter, StopFilter, GermanStemFilter
*/
public TokenStream tokenStream(String fieldName, Reader reader) {
TokenStream result = new StandardTokenizer(reader);
result = new StandardFilter(result);
result = new LowerCaseFilter(result);
result = new StopFilter(result, stopSet);
result = new GermanStemFilter(result, exclusionSet);
return result;
}