*/
    protected Hashtable<String, String> createAdminEnv() {
        return createEnvironment(//
                fessConfig.getLdapInitialContextFactory(), //
                fessConfig.getLdapSecurityAuthentication(), fessConfig.getLdapProviderUrl(), //
                fessConfig.getLdapAdminSecurityPrincipal(), //
                fessConfig.getLdapAdminSecurityCredentials());
    }

    /**

    }

    default void setLdapSecurityAuthentication(final String value) {
        setSystemProperty(Constants.LDAP_SECURITY_AUTHENTICATION, value);
    }

    default String getLdapSecurityAuthentication() {
        return getSystemProperty(Constants.LDAP_SECURITY_AUTHENTICATION, "simple");
    }

    default void setLdapProviderUrl(final String value) {