* The value is, e.g. cn=%s <br>
     * comment: Group filter for LDAP admin.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getLdapAdminGroupFilter();

    /**
     * Get the value for the key 'ldap.admin.group.base.dn'. <br>
     * The value is, e.g. ou=Group,dc=fess,dc=codelibs,dc=org <br>
     * comment: Base DN for LDAP admin group.