fessConfig.getIndexDocumentSearchIndex());
            reader.setScrollSize(fessConfig.getSuggestSourceReaderScrollSizeAsInteger());
            reader.setLimitDocNumPercentage(fessConfig.getSuggestUpdateContentsLimitNumPercentage());
            reader.setLimitNumber(fessConfig.getSuggestUpdateContentsLimitNumAsInteger());

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

    /**
     * Get the value for the key 'suggest.popular.word.cache.size'. <br>
     * The value is, e.g. 1000 <br>
     * comment: Cache size for popular word suggestion.