How to create a compound index in MongoDB through Java driver?

I want to create compound index on Age and Name in MongoDB through Java driver and here is my syntax:

coll.ensureIndex(new BasicDBObject("Age", 1),new BasicDBObject("Name", -1));
List <DBObject> list = coll.getIndexInfo();

  for (DBObject o : list) {
       System.out.println(o);
    }

but it create only 1 index not compund index and give me result this:

{ "v" : 1 , "key" : { "_id" : 1} ,"ns" :"EmployeeData.EmpPersonalData", "name":"_id_"}
{ "v" : 1 , "key" : { "Age" : 1} , "ns" : "EmployeeData.EmpPersonalData" , "name" : "Age_1" , "Name" : -1}

So how can compund index on collection can be created through java driver?