if (configuredWindowSize < minimumWindowSize) {
            logger.warn("Configured rank.fusion.window_size ({}) is less than required minimum size ({}). " + "Using minimum size instead.",
                    configuredWindowSize, minimumWindowSize);
            this.windowSize = minimumWindowSize;
        } else {
            this.windowSize = configuredWindowSize;
        }

        if (logger.isDebugEnabled()) {

labels.facet_filetype_pdf=filetype:pdf\t\
labels.facet_filetype_txt=filetype:txt\t\
labels.facet_filetype_others=filetype:others\n\

# ranking

# Window size for rank fusion.
rank.fusion.window_size=200
# Rank constant for rank fusion.
rank.fusion.rank_constant=20
# Number of threads for rank fusion.
rank.fusion.threads=-1
# Score field for rank fusion.
rank.fusion.score_field=rf_score

# acl

    /**
     * Get the value for the key 'rank.fusion.window_size'. <br>
     * The value is, e.g. 200 <br>
     * comment: Window size for rank fusion.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getRankFusionWindowSize();

    /**
     * Get the value for the key 'rank.fusion.window_size' as {@link Integer}. <br>
     * The value is, e.g. 200 <br>