LuceneIndex Headings does not index non-canonical headings

The following fragment specifically only takes canonical content instead of all headings.

/**

• The text of non-reference notes.
• @return The references in the text
  */
  public static String getHeadings(Element root) {
  StringBuilder buffer = new StringBuilder();

for (Content content : getDeepContent(root, OSISUtil.OSIS_ELEMENT_TITLE))

{ Element ele = (Element) content; getCanonicalContent(ele, null, ele.getContent().iterator(), buffer); }

return buffer.toString();
}