Multi-level nested documents query

[Pranaya Behera]

Hi,
     I have documents that are indexed are like this:
product
-isParent:true
   - child1
   -isParent:true
       - child1_1
       - child1_2
       - child1_3
   - child2
   -isParent:true
       - child2_1
       - child2_2
       - child2_3

I have used fl=*,[child parentFilter=isParent:true] it doesnt give back 
the children.
This expand=true&expand.q=*:*&expand.field=_root_&expand.rows=100 seems 
to work give me all the children but not in a single format like the 
above query does when I have only one level of nested documents but for 
multilevel it just gives me only the parent not the children.

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Thanks & Regards
Pranaya Behera