break;
        case DISMAX:
            ((DisMaxQueryBuilder) queryBuilder).add(innerQueryBuilder);
            break;
        default:
            break;
        }
        return this;
    }

    /**
     * Enumeration of supported query types.
     */
    enum QueryType {
        /** Boolean query type. */
        BOOL,
        /** DisMax query type. */
        DISMAX;
    }

    /**
     * Creates a default query builder based on the configured query type.
     * @return The default query builder (either dismax or bool query).
     */
    protected DefaultQueryBuilder createDefaultQueryBuilder() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        if ("dismax".equals(fessConfig.getQueryDefaultQueryType())) {
            final DisMaxQueryBuilder disMaxQuery = QueryBuilders.disMaxQuery();