} catch (final OpenSearchException e) {
            throw new SearchEngineClientException("Failed to process a ping request.", e);
        }
    }

    public String[] addAll(final String index, final List<Map<String, Object>> docList,
            final BiConsumer<Map<String, Object>, IndexRequestBuilder> options) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        if (StringUtil.isNotBlank(key)) {
            tags = ArrayUtils.addAll(tags, key);
        }
        final String[] fields = request.getParameterValues("field");

        final PopularWordHelper popularWordHelper = ComponentUtil.getPopularWordHelper();