Program: 35322
Project: 35322
Buggy source:
private void migrateIndexers(OldConfig oldConfig,BaseConfig newConfig){
  List<IndexerConfig> indexerConfigs=new ArrayList<>();
  for (  Indexer oldIndexer : oldConfig.getIndexers()) {
    IndexerConfig newIndexer=new IndexerConfig();
    newIndexer.setEnabled(oldIndexer.isEnabled());
    newIndexer.setHost(oldIndexer.getHost());
    newIndexer.setTimeout(oldIndexer.getTimeout());
    newIndexer.setDownloadLimit(oldIndexer.getDownloadLimit());
    newIndexer.setHitLimit(oldIndexer.getHitLimit());
    newIndexer.setHitLimitResetTime(oldIndexer.getHitLimitResetTime());
    newIndexer.setName(oldIndexer.getName());
    newIndexer.setApiKey(oldIndexer.getApikey());
    newIndexer.setLoadLimitOnRandom(oldIndexer.getLoadLimitOnRandom());
    newIndexer.setPassword(oldIndexer.getPassword());
    newIndexer.setUsername(oldIndexer.getUsername());
    newIndexer.setUserAgent(oldIndexer.getUserAgent());
    newIndexer.setPreselect(oldIndexer.isPreselect());
    newIndexer.setScore(oldIndexer.getScore());
    if (!Strings.isNullOrEmpty(oldIndexer.getType())) {
      try {
        newIndexer.setSearchModuleType(SearchModuleType.valueOf(oldIndexer.getAccessType().toUpperCase()));
      }
 catch (      IllegalArgumentException e) {
        continue;
      }
    }
 else {
      continue;
    }
    if (newIndexer.getSearchModuleType() == SearchModuleType.NEWZNAB) {
      if (!Strings.isNullOrEmpty(oldIndexer.getBackend())) {
        try {
          newIndexer.setBackend(BackendType.valueOf(oldIndexer.getAccessType().toUpperCase()));
        }
 catch (        IllegalArgumentException e) {
          continue;
        }
      }
    }
    newIndexer.setShowOnSearch(oldIndexer.isPreselect());
    newIndexer.setEnabledCategories(oldIndexer.getCategories());
    newIndexer.setSupportedSearchIds(null);
    if (oldIndexer.getSearchTypes() != null && oldIndexer.getSearchTypes().isEmpty()) {
      newIndexer.setSupportedSearchTypes(new ArrayList<>());
      for (      String s : oldIndexer.getSearchTypes()) {
        try {
          newIndexer.getSupportedSearchTypes().add(ActionAttribute.valueOf(s));
        }
 catch (        IllegalArgumentException e) {
        }
      }
    }
    newIndexer.setCategoryMapping(new IndexerCategoryConfig());
    newIndexer.setGeneralMinSize(oldIndexer.getGeneralMinSize());
    if (!Strings.isNullOrEmpty(oldIndexer.getAccessType())) {
      try {
        newIndexer.setEnabledForSearchSource(SearchSourceRestriction.valueOf(oldIndexer.getAccessType().toUpperCase()));
      }
 catch (      IllegalArgumentException e) {
        newIndexer.setEnabledForSearchSource(SearchSourceRestriction.BOTH);
      }
    }
    indexerConfigs.add(newIndexer);
  }
  newConfig.setIndexers(indexerConfigs);
}

Fixed version (ground truth):
private List<String> migrateIndexers(OldConfig oldConfig,BaseConfig newConfig){
  logger.info("String_Node_Str");
  List<String> messages=new ArrayList<>();
  List<IndexerConfig> indexerConfigs=new ArrayList<>();
  for (  Indexer oldIndexer : oldConfig.getIndexers()) {
    logger.info("String_Node_Str",oldIndexer.getName());
    try {
      if (oldIndexer.getType().toUpperCase().equals("String_Node_Str")) {
        logAsWarningAndAdd(messages,"String_Node_Str");
        continue;
      }
      IndexerConfig newIndexer=new IndexerConfig();
      newIndexer.setEnabled(oldIndexer.isEnabled());
      newIndexer.setHost(oldIndexer.getHost());
      newIndexer.setTimeout(oldIndexer.getTimeout());
      newIndexer.setDownloadLimit(oldIndexer.getDownloadLimit());
      newIndexer.setHitLimit(oldIndexer.getHitLimit());
      newIndexer.setHitLimitResetTime(oldIndexer.getHitLimitResetTime());
      newIndexer.setName(oldIndexer.getName());
      newIndexer.setApiKey(oldIndexer.getApikey());
      newIndexer.setLoadLimitOnRandom(oldIndexer.getLoadLimitOnRandom());
      newIndexer.setPassword(oldIndexer.getPassword());
      newIndexer.setUsername(oldIndexer.getUsername());
      newIndexer.setUserAgent(oldIndexer.getUserAgent());
      newIndexer.setPreselect(oldIndexer.isPreselect());
      newIndexer.setScore(oldIndexer.getScore());
      if (!Strings.isNullOrEmpty(oldIndexer.getType())) {
        try {
          newIndexer.setSearchModuleType(SearchModuleType.valueOf(oldIndexer.getType().toUpperCase()));
        }
 catch (        IllegalArgumentException e) {
          logger.error("String_Node_Str",e);
          logAsWarningAndAdd(messages,"String_Node_Str" + oldIndexer.getName() + "String_Node_Str");
          continue;
        }
      }
 else {
        logger.error("String_Node_Str");
        logAsWarningAndAdd(messages,"String_Node_Str" + oldIndexer.getName() + "String_Node_Str");
        continue;
      }
      if (newIndexer.getSearchModuleType() == SearchModuleType.NEWZNAB) {
        if (!Strings.isNullOrEmpty(oldIndexer.getBackend())) {
          try {
            newIndexer.setBackend(BackendType.valueOf(oldIndexer.getBackend().toUpperCase()));
          }
 catch (          IllegalArgumentException e) {
            logger.error("String_Node_Str",e);
            logAsWarningAndAdd(messages,"String_Node_Str" + oldIndexer.getName() + "String_Node_Str");
            continue;
          }
        }
      }
      newIndexer.setShowOnSearch(oldIndexer.isPreselect());
      List<String> enabledForCategories=new ArrayList<>();
      for (      String oldCat : oldIndexer.getCategories()) {
        Optional<Category> first=categoryProvider.getCategories().stream().filter(x -> x.getName().toLowerCase().replace("String_Node_Str","String_Node_Str").equals(oldCat.toLowerCase())).findFirst();
        if (first.isPresent()) {
          enabledForCategories.add(first.get().getName());
        }
 else {
          logAsWarningAndAdd(messages,"String_Node_Str" + oldCat + "String_Node_Str"+ oldIndexer.getName()+ "String_Node_Str");
        }
      }
      newIndexer.setEnabledCategories(enabledForCategories);
      List<IdType> supportedIdTypes=new ArrayList<>();
      for (      String s : oldIndexer.getSearchIds()) {
        try {
          String correctedSearchId=s.toUpperCase().replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str");
          supportedIdTypes.add(IdType.valueOf(correctedSearchId));
        }
 catch (        IllegalArgumentException e) {
          logger.error("String_Node_Str",e);
          logAsWarningAndAdd(messages,"String_Node_Str" + oldIndexer.getName() + "String_Node_Str");
        }
      }
      newIndexer.setSupportedSearchIds(supportedIdTypes);
      if (oldIndexer.getSearchTypes() != null && !oldIndexer.getSearchTypes().isEmpty()) {
        newIndexer.setSupportedSearchTypes(new ArrayList<>());
        for (        String s : oldIndexer.getSearchTypes()) {
          try {
            newIndexer.getSupportedSearchTypes().add(ActionAttribute.valueOf(s.toUpperCase()));
          }
 catch (          IllegalArgumentException e) {
            logger.error("String_Node_Str",e);
            logAsWarningAndAdd(messages,"String_Node_Str" + oldIndexer.getName() + "String_Node_Str");
          }
        }
      }
      newIndexer.setCategoryMapping(new IndexerCategoryConfig());
      newIndexer.setGeneralMinSize(oldIndexer.getGeneralMinSize());
      if (!Strings.isNullOrEmpty(oldIndexer.getAccessType())) {
        try {
          newIndexer.setEnabledForSearchSource(SearchSourceRestriction.valueOf(oldIndexer.getAccessType().toUpperCase().replace("String_Node_Str","String_Node_Str")));
        }
 catch (        IllegalArgumentException e) {
          logger.error("String_Node_Str",e);
          logAsWarningAndAdd(messages,"String_Node_Str" + oldIndexer.getName() + "String_Node_Str");
          newIndexer.setEnabledForSearchSource(SearchSourceRestriction.BOTH);
        }
      }
      indexerConfigs.add(newIndexer);
    }
 catch (    Exception e) {
      logger.error("String_Node_Str",e);
      logAsWarningAndAdd(messages,"String_Node_Str" + oldIndexer.getName() + "String_Node_Str");
    }
  }
  newConfig.setIndexers(indexerConfigs);
  return messages;
}