Need to do sum aggregation with probable null values of field

Elastic Stack Elasticsearch
1

Hi,

I have a field in my elastic index with a probable null value for that field.

But when I do sum aggregation on that field, even with all the values as null it returns 0 as the value from elasticsearch.

I need to have the output as null when all the documents have null values for that field. Is there a way to achieve this using elasticsearch?

Thanks

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