}
            }
        }
        return StringUtil.EMPTY_STRINGS;
    }

    public OptionalEntity<Map<String, Object>> getDocumentByDocId(final String docId, final String[] fields,
            final OptionalThing<FessUserBean> userBean) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

            if (docIds == null) {
                throw new WebApiException(HttpServletResponse.SC_BAD_REQUEST, "No searched urls.");
            }

            searchHelper.getDocumentByDocId(docId, new String[] { fessConfig.getIndexFieldUrl(), fessConfig.getIndexFieldLang() },
                    OptionalThing.empty()).ifPresent(doc -> {