* @return the access result data, or null if retrieval fails
     */
    private AccessResultData<?> getAccessResultData(final OpenSearchAccessResult accessResult) {
        try {
            return accessResult.getAccessResultData();
        } catch (final Exception e) {
            logger.warn("Failed to get data from {}", accessResult.getUrl(), e);
        }
        return null;

        }

        @Override
        public void setLastModified(Long lastModified) {
            // Do nothing in test
        }

        @Override
        public AccessResultData<String> getAccessResultData() {
            return null;
        }

        @Override
        public void setContentLength(Long contentLength) {
            // Do nothing in test
        }

        @Override