docs: private Node[] processIndexString(final String theIndexString, final List<Node> contents, final Document theTargetDocument, final IndexEntryFoundListener theIndexEntryFoundListener) {
          final IndexEntry[] indexEntries = IndexStringProcessor.processIndexString(theIndexString, contents);
  
  
          for (final IndexEntry indexEntrie : indexEntries) {
              theIndexEntryFoundListener.foundEntry(indexEntrie);
          }
  
          return transformToNodes(indexEntries, theTargetDocument, null);
      }