Access key value pair from the index using document fields in a script

I am trying to access a nested field the form of a map (basically key value
pairs) using document fields inside a script. But I am only able to get the
values and not the names Is that possible ? I looked at the code
for ScriptDocValues and it looks like it supports only four
types Longs, Doubles, GeoPoints and Strings. Here is the format i am trying
to get

"nested_field_name": {
"field_name1": field_value (number),
"field_name2": field_value (number),
"field_name3": field_value (number)
}

Is there any way i can access a key value pair using document fields
(doc[nested_field_name] format ) ?

Thanks
Srini

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