[LUCENE-10008] CommonGramsFilterFactory doesn't respect ignoreCase=true when default stopwords are used

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 9.0, 8.11
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Chris M. Hostetter
• Created: 17/Jun/21 01:13
• Updated: 28/Aug/22 16:23
• Resolved: 21/Oct/21 14:34

Description

CommonGramsFilterFactory's use of the "words" and "ignoreCase" config options is inconsistent with how StopFilterFactory uses them - leading to "ignoreCase=true" not being respected unless "words" is specified...

StopFilterFactory...

  public void inform(ResourceLoader loader) throws IOException {
    if (stopWordFiles != null) {
      ...
    } else {
      ...
      stopWords = new CharArraySet(EnglishAnalyzer.ENGLISH_STOP_WORDS_SET, ignoreCase);
    }
  }

CommonGramsFilterFactory...

  @Override
  public void inform(ResourceLoader loader) throws IOException {
    if (commonWordFiles != null) {
      ...
    } else {
      commonWords = EnglishAnalyzer.ENGLISH_STOP_WORDS_SET;
    }
  }

Issue Links

• links to: GitHub Pull Request #2573