Null values in number field in Elasticsearch

Elastic Stack Elasticsearch
1

I have a number fields called carparks in Elasticsearch and I would like to create a new field using inline script, the inline script looks like this:
int total = 0;if(doc['carparks'].value == null) {total = 15;} else if(doc['carparks'].value == 0) {total = 1;} else {total = 2;} return total;

However it looks like all the null carparks values have been transformed to 0, so I cannot distinguish the condition between doc['carparks'].value == null and doc['carparks'].value == 0.

Can anyone please help this?

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