code: public void filteredTransliterate(Replaceable text,
                                           Position index,
                                           boolean incremental) {
          filteredTransliterate(text, index, incremental, false);
      }
docs: Transliterate a substring of text, as specified by index, taking filters
  into account.  This method is for subclasses that need to delegate to
  another transliterator, such as CompoundTransliterator.
  @param text the text to be transliterated
  @param index the position indices
  @param incremental if TRUE, then assume more characters may be inserted
  at index.limit, and postpone processing to accomodate future incoming
  characters