public abstract String getSimilarDocHash();

    public String getTrackTotalHits() {
        return null;
    }

    public Float getMinScore() {
        return null;
    }

    public boolean hasConditionQuery() {
        final Map<String, String[]> conditions = getConditions();
        return !isEmptyArray(conditions.get(AS_Q))//
                || !isEmptyArray(conditions.get(AS_EPQ))//

        if (exists) {
            queryBuf.append(')');
        }
    }

    protected String buildBaseQuery() {
        final StringBuilder queryBuf = new StringBuilder(255);
        if (params.hasConditionQuery()) {
            appendConditions(queryBuf, params.getConditions());
        } else {
            final String query = params.getQuery();
            if (StringUtil.isNotBlank(query)) {