COUNT(DISTINCT field_name) is returning null

Elastic Stack Elasticsearch
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In ElasticSearch 7.4.2 version, COUNT(DISTINCT field_name) is returning null instead of 0. Canvas is showing below error

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elastic7.4.PNG1916×752 92.4 KB

In ElasticSearch 7.3 version, COUNT(DISTINCT field_name) is returning 0

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elastic7.3.PNG1882×759 77.9 KB

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