getQueryLanguages().ifPresent(langs -> stream(langs).of(stream -> stream.forEach(lang -> {
            boolQuery.should(
                    builder.apply(fessConfig.getIndexFieldTitle() + "_" + lang, fessConfig.getQueryBoostTitleLangAsDecimal().floatValue()));
            boolQuery.should(builder.apply(fessConfig.getIndexFieldContent() + "_" + lang,
                    fessConfig.getQueryBoostContentLangAsDecimal().floatValue()));

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not decimal.
     */
    java.math.BigDecimal getQueryBoostTitleLangAsDecimal();

    /**
     * Get the value for the key 'query.boost.content'. <br>
     * The value is, e.g. 0.05 <br>