public void addDocumentMappingRewriteRule(final UnaryOperator<String> rule) {
        docMappingRewriteRuleList.add(rule);
    }

    public boolean updateAlias(final String newIndex) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String updateAlias = fessConfig.getIndexDocumentUpdateIndex();
        final String searchAlias = fessConfig.getIndexDocumentSearchIndex();
        final GetIndexResponse response1 =