code: public void bump(CmsClientSitemapEntry entry) {
  
          CmsDetailPageTable table = getDetailPageTable().copy();
          table.bump(entry.getId());
          CmsSitemapChange change = new CmsSitemapChange(entry.getId(), entry.getSitePath(), ChangeType.bumpDetailPage);
          change.setDetailPageInfos(table.toList());
          commitChange(change, null);
      }
docs: Makes the given sitemap entry the default detail page for its detail page type.<p>
  
  @param entry an entry representing a detail page