private Set<String> normalizeKeywordSet(Set<String> keywordSet) {
    if (!myIgnoreCase) {
      return new HashSet<>(keywordSet);
    }

    final Set<String> result = new HashSet<>();
    for (String s : keywordSet) {
      result.add(StringUtil.toUpperCase(s));
    }
    return result;
  }
private Set<String> normalizeKeywordSet(Set<String> keywordSet)