* @param target The target object.
     * @return The URL string, or null if not found.
     */
    private String getUrl(final Object target) {
        final BeanDesc beanDesc = BeanDescFactory.getBeanDesc(target.getClass());
        final PropertyDesc sessionIdProp = beanDesc.getPropertyDesc(URL);
        final Object sessionId = sessionIdProp.getValue(target);
        return sessionId == null ? null : sessionId.toString();
    }

        } catch (final OpenSearchAccessException e) {
            final Throwable cause = e.getCause();
            if (cause != null && "VersionConflictEngineException".equals(cause.getClass().getSimpleName())) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Failed to insert {}", urlQueue, e);
                }
                return;
            }

        if (!httpClientPropertyMap.isEmpty()) {
            final BeanDesc beanDesc = BeanDescFactory.getBeanDesc(closeableHttpClient.getClass());
            for (final Map.Entry<String, Object> entry : httpClientPropertyMap.entrySet()) {
                final String propertyName = entry.getKey();
                if (beanDesc.hasPropertyDesc(propertyName)) {

                        }
                    }
                }
                throw new ChildUrlsException(requestDataSet, this.getClass().getName() + "#getResponseData");
            } else {
                responseData.setHttpStatusCode(Constants.NOT_FOUND_STATUS_CODE);
                responseData.setCharSet(charset);

        final StringBuilder sb = new StringBuilder();
        try (BufferedReader br = new BufferedReader(new InputStreamReader(
                this.getClass().getClassLoader().getResourceAsStream("suggest_indices/suggest_settings_array.json")))) {

            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }

                    requestDataSet.add(RequestDataBuilder.newRequestData().get().url("storage://" + bucketName + "/" + objectName).build());
                }
                throw new ChildUrlsException(requestDataSet, this.getClass().getName() + "#getResponseData");
            }
            // check file size
            responseData.setContentLength(statObject.size());
            checkMaxContentLength(responseData);

                return func.apply(this).actionGet(connTimeout, TimeUnit.MILLISECONDS);
            } catch (final IndexNotFoundException | VersionConflictEngineException e) {
                logger.debug("{} occurs.", e.getClass().getName(), e);
                throw e;
            } catch (final Exception e) {
                if (retryCount > maxRetryCount) {
                    throw e;
                }

        final StringBuilder sb = new StringBuilder();
        try (BufferedReader br = new BufferedReader(
                new InputStreamReader(this.getClass().getClassLoader().getResourceAsStream("suggest_indices/suggest_settings.json")));) {

            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }

                    }
                }
                ftpClientQueue.offer(client);
                throw new ChildUrlsException(requestDataSet, this.getClass().getName() + "#getResponseData");
            }

            final FTPFile[] files = client.listFiles(null, FTPFileFilters.NON_NULL);
            validateRequest(client);
            for (final FTPFile f : files) {

                        }
                    }
                }
                throw new ChildUrlsException(requestDataSet, this.getClass().getName() + "#getResponseData");
            } else {
                responseData.setHttpStatusCode(Constants.NOT_FOUND_STATUS_CODE);
                responseData.setCharSet(charset);