if (!isBind) {
            if (fessConfig.getLdapAdminSecurityPrincipal() == null || fessConfig.getLdapAdminSecurityCredentials() == null) {
                // no credentials
                return !fessConfig.isLdapAuthValidation();
            }
            final Hashtable<String, String> env = createAdminEnv();
            try (DirContextHolder holder = getDirContext(() -> env)) {
                final DirContext context = holder.get();

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

    /**
     * Get the value for the key 'ldap.max.username.length'. <br>
     * The value is, e.g. -1 <br>