}
        // thumbnail
        final String thumbnailUrl = getThumbnailUrl(responseData, document);
        if (StringUtil.isNotBlank(thumbnailUrl)) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldThumbnail(), thumbnailUrl);
        }

        // from config
        final String scriptType = crawlingConfig.getScriptType();

```

### Step 3: Test with Thumbnailer

We used [Thumbnailer](https://github.com/minio/thumbnailer) to listen for MinIO notifications when a new JPEG file is uploaded (HTTP PUT). Triggered by a notification, Thumbnailer uploads a thumbnail of new image to MinIO server. To start with, download and install Thumbnailer.

```
git clone https://github.com/minio/thumbnailer/
npm install
```