MongoDB connector Bonita BPM

I wish to know if it's possible to read a Field from a specific document in mongoDB using Bonita script. I have used the following article to link between Bonita and MongoDB:
http://community.bonitasoft.com/mongo-db-connector

This is the way to read all documents in a collection presented in this article:

read.getStatus() + " " + read.getDocumentsList().toString()

I need to change the connector code, how I can do that?

Thanks!