code: public Set<String> getReturnFields() {
  
          if (m_fieldAdded) {
              for (CmsSearchField field : getLuceneFields()) {
                  if (field.isStored() && !LAZY_FIELDS.contains(field.getName())) {
                      m_returnFields.add(field.getName());
                  }
              }
          }
          m_fieldAdded = false;
          return m_returnFields;
      }
docs: Returns the field names used for a regular result.<p>
  
  @return the field names used for a regular result