protected String getClientId() {
        return ComponentUtil.getFessConfig().getSystemProperty(AZUREAD_CLIENT_ID, StringUtil.EMPTY);
    }

    /**
     * Gets the Azure AD client secret from configuration.
     * @return The client secret.
     */
    protected String getClientSecret() {
        return ComponentUtil.getFessConfig().getSystemProperty(AZUREAD_CLIENT_SECRET, StringUtil.EMPTY);
    }

    /**

        final String commandTimeoutStr = fessConfig.getSystemProperty("thumbnail.command.timeout");
        if (commandTimeoutStr != null) {
            commandTimeout = Long.parseLong(commandTimeoutStr);
        }
        final String commandDestroyTimeoutStr = fessConfig.getSystemProperty("thumbnail.command.destroy.timeout");
        if (commandDestroyTimeoutStr != null) {

        final Map<String, String> systemPropMap = new HashMap<>();
        FessProp.propMap.clear();
        FessConfig fessConfig = new FessConfig.SimpleImpl() {
            @Override
            public String getSystemProperty(final String key, final String defaultValue) {
                return systemPropMap.getOrDefault(key, defaultValue);
            }
        };
        ComponentUtil.setFessConfig(fessConfig);