}
        return new Script(buf.toString());
    }

    /**
     * Returns the reindex script source.
     *
     * @return The reindex script source.
     */
    public String getReindexScriptSource() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String langField = fessConfig.getIndexFieldLang();
        final String code = Arrays.stream(langFields)

                .replace("__SIZE__", fessConfig.getIndexReindexSize())//
                .replace("__DEST_INDEX__", toIndex)//
                .replace("__SCRIPT_SOURCE__", ComponentUtil.getLanguageHelper().getReindexScriptSource());
        return reindex(fromIndex, toIndex, source, waitForCompletion);
    }

    /**
     * Reindexes documents from one index to another.
     *