.popularWords()
                        .setSize(fessConfig.getSuggestPopularWordSizeAsInteger())
                        .setWindowSize(fessConfig.getSuggestPopularWordWindowSizeAsInteger())
                        .setQueryFreqThreshold(fessConfig.getSuggestPopularWordQueryFreqAsInteger());
                popularWordsRequestBuilder.setSeed(baseSeed);

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getSuggestPopularWordWindowSizeAsInteger();

    /**
     * Get the value for the key 'suggest.popular.word.query.freq'. <br>
     * The value is, e.g. 10 <br>
     * comment: Query frequency for popular word suggestion.