title: Triple indexes in MarkLogic 8
body: <p>I am writing some POC's for ML8 Java API.
  I have enabled triple index for my database in ML8, but I was not able to find any documentation wrt it in the Java API documentation.
  So, not sure how to make use of this triple index from Java API or if its a pure database setup thing. 
  Please share some info if anyone has..</p>