docs: protected void cleanSpecTopicWhenCreatedOrUpdated(final ITopicNode topicNode) {
          topicNode.setDescription(null);
          topicNode.setTags(new ArrayList<String>());
          topicNode.setRemoveTags(new ArrayList<String>());
          topicNode.setAssignedWriter(null);
          if (topicNode instanceof SpecTopic) {
              final SpecTopic specTopic = (SpecTopic) topicNode;
              specTopic.setSourceUrls(new ArrayList<String>());
              specTopic.setType(null);
          }
      }