Program: 2113
Project: 2113
Buggy source:
public Collection<Note> find(String searchText){
  if ("String_Node_Str".equals(searchText.trim())) {
    return Collections.EMPTY_LIST;
  }
  searchText=searchText.trim();
  String patternStr="String_Node_Str";
  String replaceStr="String_Node_Str";
  Pattern pattern=Pattern.compile(patternStr);
  Matcher matcher=pattern.matcher(searchText);
  searchText=matcher.replaceAll(replaceStr);
  if (Pattern.matches("String_Node_Str",searchText)) {
    searchText=searchText + "String_Node_Str";
  }
  LOG.info("String_Node_Str" + searchText);
  final Collection<Note> toReturn=new ArrayList<Note>();
  try {
    IndexReader newReader=reader.reopen();
    if (newReader != reader) {
      LOG.info("String_Node_Str");
      reader.close();
    }
    reader=newReader;
    reader.reopen();
    final IndexSearcher searcher=new IndexSearcher(reader);
    final Analyzer analyzer=new StandardAnalyzer(Version.LUCENE_CURRENT);
    AnalyzerUtils.displayTokensWithFullDetails(analyzer,searchText);
    QueryParser parser=new CustomQueryParser("String_Node_Str",analyzer);
    parser.setDefaultOperator(QueryParser.Operator.AND);
    Query query=parser.parse(searchText);
    LOG.info("String_Node_Str" + query.toString());
    Collector collector=new Collector(){
      @Override public void setScorer(      Scorer scorer) throws IOException {
      }
      @Override public void collect(      int doc) throws IOException {
        int scoreId=doc;
        Document document=searcher.doc(scoreId);
        int docId=Integer.parseInt(document.getField("String_Node_Str").stringValue());
        NoteRepository rep=Lookup.getDefault().lookup(NoteRepository.class);
        toReturn.add(rep.get(docId,false));
      }
      @Override public void setNextReader(      IndexReader reader,      int docBase) throws IOException {
      }
      @Override public boolean acceptsDocsOutOfOrder(){
        return true;
      }
    }
;
    searcher.search(query,collector);
  }
 catch (  ParseException ex) {
    Exceptions.printStackTrace(ex);
  }
catch (  CorruptIndexException ex) {
    Exceptions.printStackTrace(ex);
  }
catch (  IOException ex) {
    Exceptions.printStackTrace(ex);
  }
  return toReturn;
}

Fixed version (ground truth):
public Collection<Note> find(String searchText){
  if ("String_Node_Str".equals(searchText.trim())) {
    return Collections.EMPTY_LIST;
  }
  long start=System.currentTimeMillis();
  searchText=searchText.trim();
  String patternStr="String_Node_Str";
  String replaceStr="String_Node_Str";
  Pattern pattern=Pattern.compile(patternStr);
  Matcher matcher=pattern.matcher(searchText);
  searchText=matcher.replaceAll(replaceStr);
  if (Pattern.matches("String_Node_Str",searchText)) {
    searchText=searchText + "String_Node_Str";
  }
  LOG.info("String_Node_Str" + searchText);
  final Collection<Note> toReturn=new ArrayList<Note>();
  try {
    IndexReader newReader=reader.reopen();
    if (newReader != reader) {
      LOG.info("String_Node_Str");
      reader.close();
    }
    reader=newReader;
    reader.reopen();
    final IndexSearcher searcher=new IndexSearcher(reader);
    final Analyzer analyzer=new StandardAnalyzer(Version.LUCENE_CURRENT);
    AnalyzerUtils.displayTokensWithFullDetails(analyzer,searchText);
    QueryParser parser=new CustomQueryParser("String_Node_Str",analyzer);
    parser.setDefaultOperator(QueryParser.Operator.AND);
    Query query=parser.parse(searchText);
    LOG.info("String_Node_Str" + query.toString());
    Collector collector=new Collector(){
      @Override public void setScorer(      Scorer scorer) throws IOException {
      }
      @Override public void collect(      int doc) throws IOException {
        int scoreId=doc;
        Document document=searcher.doc(scoreId);
        int docId=Integer.parseInt(document.getField("String_Node_Str").stringValue());
        NoteRepository rep=Lookup.getDefault().lookup(NoteRepository.class);
        toReturn.add(rep.get(docId,false));
      }
      @Override public void setNextReader(      IndexReader reader,      int docBase) throws IOException {
      }
      @Override public boolean acceptsDocsOutOfOrder(){
        return true;
      }
    }
;
    searcher.search(query,collector);
  }
 catch (  ParseException ex) {
    Exceptions.printStackTrace(ex);
  }
catch (  CorruptIndexException ex) {
    Exceptions.printStackTrace(ex);
  }
catch (  IOException ex) {
    Exceptions.printStackTrace(ex);
  }
  long delta=System.currentTimeMillis() - start;
  LOG.info("String_Node_Str" + delta / 1000.0 + "String_Node_Str" + toReturn.size() + "String_Node_Str");
  return toReturn;
}