docs: public void addFieldQuery(CmsSearchFieldQuery query) {
  
          if (m_fieldQueries == null) {
              m_fieldQueries = new ArrayList<CmsSearchFieldQuery>();
              m_fields = new ArrayList<String>();
          }
          m_fieldQueries.add(query);
          // add the used field used in the fields query to the list of fields used in the search
          if (!m_fields.contains(query.getFieldName())) {
              m_fields.add(query.getFieldName());
          }
      }