driver-core/src/main/com/mongodb/client/gridfs/model/GridFSFile.java
@Deprecated
    public String getContentType() {
        if (extraElements != null && extraElements.containsKey("contentType")) {
            return extraElements.getString("contentType");
        } else {
            throw new MongoGridFSException("No contentType data for this GridFS file");
        }
    }
@Deprecated
    public String getContentType() {
        if (extraElements != null && extraElements.containsKey("contentType")) {
            return extraElements.getString("contentType");
        } else {
            throw new MongoGridFSException("No contentType data for this GridFS file");
        }
    }
The content type of the file

@return the content type of the file
@deprecated content type information should be stored the metadata document instead.