How to fetch current document(record) in overrided runAsDouble method?

I have created a custom plugin implementing scriptengineservice and overrided runAsDouble method.But facing problem in fetching current document.
I used below code :-
LeafDocLookup doc = lookup.getLeafSearchLookup(leafReaderContext).doc();
Exception:-IndexOutOfBounds exception

Is there any better way to fetch current LeafDocLookup??

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