*/
    protected String processJsonSearchPreference(final HttpServletRequest req, final String query) {
        final String pref = ComponentUtil.getFessConfig().getQueryJsonDefaultPreference();
        if (PREFERENCE_QUERY.equals(pref)) {
            return Integer.toString(query.hashCode());
        }
        if (StringUtil.isNotBlank(pref)) {
            return pref;
        }

     * The value is, e.g. _query <br>
     * comment: Default preference for JSON queries.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getQueryJsonDefaultPreference();

    /**
     * Get the value for the key 'query.gsa.default.preference'. <br>
     * The value is, e.g. _query <br>
     * comment: Default preference for GSA queries.