*/
    @Size(max = 10)
    public String loginLink;

    /**
     * Enable or disable thumbnail generation for documents.
     * When enabled, thumbnails are generated for supported file types.
     */
    @Size(max = 10)
    public String thumbnail;

    /**
     * Types of crawling failures to ignore during crawling operations.

thumbnail.html.image.format=png
# XPath to select images for thumbnails.
thumbnail.html.image.xpath=//IMG
# File extensions to exclude from thumbnail generation.
thumbnail.html.image.exclude.extensions=svg,html,css,js
# Interval for thumbnail generator.
thumbnail.generator.interval=0
# Targets for thumbnail generator (e.g., all).
thumbnail.generator.targets=all

        INGEST("fess-ingest"), //
        /** Script plugins */
        SCRIPT("fess-script"), //
        /** Web application plugins */
        WEBAPP("fess-webapp"), //
        /** Thumbnail generator plugins */
        THUMBNAIL("fess-thumbnail"), //
        /** Crawler plugins */
        CRAWLER("fess-crawler"), //
        /** Unknown/generic JAR files */
        UNKNOWN("jar");

    String THUMBNAIL_HTML_IMAGE_THUMBNAIL_WIDTH = "thumbnail.html.image.thumbnail.width";

    /** The key of the configuration. e.g. 100 */
    String THUMBNAIL_HTML_IMAGE_THUMBNAIL_HEIGHT = "thumbnail.html.image.thumbnail.height";

    /** The key of the configuration. e.g. png */
    String THUMBNAIL_HTML_IMAGE_FORMAT = "thumbnail.html.image.format";

    /** The key of the configuration. e.g. //IMG */

    exit 1
  fi
  check_command pdftoppm
  check_command unoconv
  tmp_pdf_file=/tmp/thumbnail.$$.pdf
  unoconv -e PageRange=1-1 -o ${tmp_pdf_file} -f pdf "${target_file}"
  if [[ ! -f ${tmp_pdf_file} ]] ; then
    echo "unoconv does not work."
    exit 1
  fi
  tmp_png_prefix=/tmp/thumbnail.png.$$
  pdftoppm -png -singlefile ${tmp_pdf_file} ${tmp_png_prefix}
  tmp_png_file="${tmp_png_prefix}.png"

        }
        return value;
    }

    /**
     * Updates the thumbnail field in the search index.
     * @param thumbnailId The thumbnail ID.
     * @param value The thumbnail value to update.
     */
    protected void updateThumbnailField(final String thumbnailId, final String value) {
        // TODO bulk
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

	<component name="msofficeThumbnailGenerator" class="org.codelibs.fess.thumbnail.impl.CommandGenerator">
		<property name="name">"msofficeThumbnailGenerator"</property>
		<property name="commandList">
			["${path}/generate-thumbnail",
			"msoffice",
			"${url}",
			"${outputFile}"]
		</property>
		<property name="generatorList">
			["${path}/generate-thumbnail"]
		</property>
		<postConstruct name="addCondition">

    public void setThumbnailId_Equal(String thumbnailId) {
        setThumbnailId_Term(thumbnailId, null);
    }

    public void setThumbnailId_Equal(String thumbnailId, ConditionOptionCall<TermQueryBuilder> opLambda) {
        setThumbnailId_Term(thumbnailId, opLambda);
    }

    public void setThumbnailId_Term(String thumbnailId) {
        setThumbnailId_Term(thumbnailId, null);
    }

        // Default constructor
    }

    /**
     * Gets the thumbnail location URL.
     * @return the thumbnail URL
     */
    public String getThumbnailLoc() {
        return thumbnailLoc;
    }

    /**
     * Sets the thumbnail location URL.
     * @param thumbnailLoc the thumbnail URL to set
     */
    public void setThumbnailLoc(final String thumbnailLoc) {

```

### 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
```