}

    protected void appendQuery(final StringBuilder queryBuf, final String query) {
        String q = query;
        for (final String s : ComponentUtil.getFessConfig().getCrawlerDocumentSpaces()) {
            q = q.replace(s, SPACE);
        }
        final boolean exists = q.indexOf(OR) != -1 || q.indexOf(OR_ALT) != -1;
        queryBuf.append(' ');
        if (exists) {