final ListObjectsArgs args = ListObjectsArgs.builder().bucket(fessConfig.getStorageBucket())
                    .prefix(prefix != null && prefix.length() > 0 ? prefix + "/" : prefix).recursive(false).includeUserMetadata(false)
                    .useApiVersion1(false).build();
            for (final Result<Item> result : minioClient.listObjects(args)) {
                final Map<String, Object> map = new HashMap<>();