final OptionalThing<HttpServletRequest> requestOpt = LaRequestUtil.getOptionalRequest();
        final OptionalThing<HttpServletResponse> responseOpt = LaResponseUtil.getOptionalResponse();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final int rankConstant = fessConfig.getRankFusionRankConstantAsInteger();
        final int size = windowSize / searchers.length;