/**
   * Index a forum in a group.
   *
   * @param parentResourceContext
   * @param businessGroup
   * @param indexWriter
   * @throws IOException
   */
  @Override
  public void doIndex(
      final SearchResourceContext parentResourceContext,
      final Object businessObj,
      final OlatFullIndexer indexWriter)
      throws IOException, InterruptedException {
    if (!(businessObj instanceof BusinessGroup)) {
      throw new AssertException("businessObj must be BusinessGroup");
    }
    final BusinessGroup businessGroup = (BusinessGroup) businessObj;

    final NarrowedPropertyManager npm = NarrowedPropertyManager.getInstance(businessGroup);
    final ForumManager fom = ForumManager.getInstance();

    final Property forumKeyProperty =
        npm.findProperty(
            null, null, CollaborationTools.PROP_CAT_BG_COLLABTOOLS, CollaborationTools.KEY_FORUM);
    // Check if forum-property exist
    if (forumKeyProperty != null) {
      final Long forumKey = forumKeyProperty.getLongValue();
      final Forum forum = fom.loadForum(forumKey);
      final SearchResourceContext forumSearchResourceContext =
          new SearchResourceContext(parentResourceContext);
      forumSearchResourceContext.setBusinessControlFor(
          BusinessGroupMainRunController.ORES_TOOLFORUM);
      forumSearchResourceContext.setDocumentType(TYPE);
      forumSearchResourceContext.setDocumentContext(businessGroup.getKey() + " " + forumKey);
      forumSearchResourceContext.setParentContextType(GroupDocument.TYPE);
      forumSearchResourceContext.setParentContextName(businessGroup.getName());
      doIndexAllMessages(forumSearchResourceContext, forum, indexWriter);
    }
  }
  /**
   * Index a forum in a group.
   *
   * @param parentResourceContext
   * @param businessGroup
   * @param indexWriter
   * @throws IOException
   */
  public void doIndex(
      SearchResourceContext parentResourceContext, Object businessObj, OlatFullIndexer indexWriter)
      throws IOException, InterruptedException {
    if (!(businessObj instanceof BusinessGroup))
      throw new AssertException("businessObj must be BusinessGroup");
    BusinessGroup businessGroup = (BusinessGroup) businessObj;

    NarrowedPropertyManager npm = NarrowedPropertyManager.getInstance(businessGroup);
    ForumManager fom = ForumManager.getInstance();

    Property forumKeyProperty =
        npm.findProperty(
            null, null, CollaborationTools.PROP_CAT_BG_COLLABTOOLS, CollaborationTools.KEY_FORUM);
    // Check if forum-property exist
    if (forumKeyProperty != null) {
      Long forumKey = forumKeyProperty.getLongValue();
      Forum forum = fom.loadForum(forumKey);
      SearchResourceContext forumSearchResourceContext =
          new SearchResourceContext(parentResourceContext);
      forumSearchResourceContext.setBusinessControlFor(
          BusinessGroupMainRunController.ORES_TOOLFORUM);
      forumSearchResourceContext.setDocumentType(TYPE);
      forumSearchResourceContext.setParentContextType(GroupDocument.TYPE);
      forumSearchResourceContext.setParentContextName(businessGroup.getName());
      if (forum == null) { // fxdiff: FXOLAT-104 warn about missing forums
        logError(
            "found a forum-key "
                + forumKey
                + " for businessgroup "
                + businessGroup.getName()
                + " ["
                + businessGroup.getKey()
                + "] to index a forum that could not be "
                + "found by key! skip indexing, check if forum should still be enabled. context: "
                + forumSearchResourceContext.getResourceUrl(),
            null);
        return;
      }
      doIndexAllMessages(forumSearchResourceContext, forum, indexWriter);
    }
  }