code: @Override
     public Section getIndex(String title, int nesting, List<? extends BaseStyler> stylers) throws VectorPrintException, InstantiationException, IllegalAccessException {
        if (nesting < 1) {
           throw new VectorPrintException("chapter numbering starts with 1, wrong number: " + nesting);
        }
        if (sections.get(nesting) == null) {
           sections.put(nesting, new ArrayList<>(10));
        }
        Section current;
        if (nesting == 1) {
           List<Section> chapters = sections.get(1);
           current = new Chapter(createElement(title, Paragraph.class, stylers), chapters.size() + 1);
           chapters.add(current);
        } else {
           List<Section> parents = sections.get(nesting - 1);
           Section parent = parents.get(parents.size() - 1);
           current = parent.addSection(createParagraph(title, stylers));
           sections.get(nesting).add(current);
        }
        return styleHelper.style(current, null, stylers);
     }
docs: create the Section, style the title, style the section and return the styled section.
  
  @param title
  @param nesting
  @param stylers
  @return
  @throws VectorPrintException
  @throws InstantiationException
  @throws IllegalAccessException