final String callback = LaRequestUtil.getOptionalRequest().map(req -> req.getParameter("callback")).orElse(null);
        final boolean isJsonp = ComponentUtil.getFessConfig().isApiJsonpEnabled() && StringUtil.isNotBlank(callback);

        final HttpServletResponse response = LaResponseUtil.getResponse();
        response.setStatus(status);

        final StringBuilder buf = new StringBuilder(1000);

     * The value is, e.g. false <br>
     * @return The determination, true or false. (if not found, exception but basically no way)
     */
    boolean isApiJsonpEnabled();

    /**
     * Get the value for the key 'api.ping.search_engine.fields'. <br>
     * The value is, e.g. status,timed_out <br>