lower = lower.substring(denyPrefix.length());
            permission = permission.substring(denyPrefix.length());
            aclPrefix = ComponentUtil.getFessConfig().getRoleSearchDeniedPrefix();
        } else {
            aclPrefix = StringUtil.EMPTY;
        }
        if (StringUtil.isBlank(permission)) {
            return null;
        }
        if (lower.startsWith(userPrefix)) {

        final String roleField = fessConfig.getIndexFieldRole();
        roleSet.stream().forEach(name -> roleQuery.should(QueryBuilders.termQuery(roleField, name)));
        final String deniedPrefix = fessConfig.getRoleSearchDeniedPrefix();
        roleSet.stream().forEach(name -> roleQuery.mustNot(QueryBuilders.termQuery(roleField, deniedPrefix + name)));
        boolQuery.filter(roleQuery);
    }

    /**

     * The value is, e.g. D <br>
     * comment: Prefix for denied roles in search.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getRoleSearchDeniedPrefix();

    /**
     * Get the value for the key 'cookie.default.path'. <br>
     * The value is, e.g. / <br>
     * comment: The default path of cookie (basically '/' if no context path)