final StringBuilder resultBuf = new StringBuilder();

        final String exportPath = fessConfig.getIndexExportPath();
        final Set<String> excludeFields = Arrays.stream(fessConfig.getIndexExportExcludeFields().split(","))
                .map(String::trim)
                .filter(s -> !s.isEmpty())
                .collect(Collectors.toSet());

     * The value is, e.g. cache <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexExportExcludeFields();

    /**
     * Get the value for the key 'index.export.scroll.size'. <br>
     * The value is, e.g. 100 <br>