How to find all fields that don't have values?

Elastic Stack Elasticsearch
1

I have an index that has around a thousand fields and several million documents. Many of the fields are empty.

How can I query the index to find out which fields do not have values?

2

See https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-exists-query.html#find-docs-null-values

3

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