code: public static void validateAndFixRelationships(final Topic topic) {
          /* remove relationships to this topic in the parent collection */
          final ArrayList<TopicToTopic> removeList = new ArrayList<TopicToTopic>();
          for (final TopicToTopic topicToTopic : topic.getParentTopicToTopics())
              if (topicToTopic.getRelatedTopic().getTopicId().equals(topic.getTopicId())) removeList.add(topicToTopic);
  
          for (final TopicToTopic topicToTopic : removeList)
              topic.getParentTopicToTopics().remove(topicToTopic);
  
          /* remove relationships to this topic in the child collection */
          final ArrayList<TopicToTopic> removeChildList = new ArrayList<TopicToTopic>();
          for (final TopicToTopic topicToTopic : topic.getChildTopicToTopics())
              if (topicToTopic.getMainTopic().getTopicId().equals(topic.getTopicId())) removeChildList.add(topicToTopic);
  
          for (final TopicToTopic topicToTopic : removeChildList)
              topic.getChildTopicToTopics().remove(topicToTopic);
      }
docs: Validate and Fix a topics relationships to ensure that the topics related topics are still matched by the Related Topics
  themselves.
  
  @param topic The topic to validate and fix the relationships for.