* @param newIndex the new index to point aliases to
     * @return true if the alias update was successful, false otherwise
     */
    public boolean updateAlias(final String newIndex) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String updateAlias = fessConfig.getIndexDocumentUpdateIndex();
        final String searchAlias = fessConfig.getIndexDocumentSearchIndex();

                                if (searchEngineClient.copyDocIndex(fromIndex, toIndex, replaceAliases) && replaceAliases
                                        && !searchEngineClient.updateAlias(toIndex)) {
                                    logger.warn("Failed to update aliases for {} and {}", fromIndex, toIndex);
                                }
                            } finally {