final OptionalThing<HttpServletResponse> responseOpt = LaResponseUtil.getOptionalResponse();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final int rankConstant = fessConfig.getRankFusionRankConstantAsInteger();
        final int size = windowSize / searchers.length;
        if (logger.isDebugEnabled()) {
            logger.debug("The searcher window size is {} and a rank constant is {}.", size, rankConstant);