private static final long serialVersionUID = 1L;

            public boolean isAppendQueryParameter() {
                return true;
            }

            public String getIndexFieldMimetype() {
                return "mimetype";
            }
        });

        document.put("mimetype", "text/html");
        String resultUrl = viewHelper.appendQueryParameter(document, url);

        // anchor
        putResultDataBody(dataMap, fessConfig.getIndexFieldAnchor(), getAnchorList(document, responseData));
        // mimetype
        putResultDataBody(dataMap, fessConfig.getIndexFieldMimetype(), mimeType);
        if (fileTypeHelper != null) {
            // filetype
            putResultDataBody(dataMap, fessConfig.getIndexFieldFiletype(), fileTypeHelper.get(mimeType));
        }

     * The value is, e.g. mimetype <br>
     * comment: Field name for MIME type in the index.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexFieldMimetype();

    /**
     * Get the value for the key 'index.field.parent_id'. <br>
     * The value is, e.g. parent_id <br>
     * comment: Field name for parent ID in the index.