search records with _exists_ doesn't return records with empty but existing field

[daviortega]

The search:
https://api.oip.io/oip/o5/record/search?limit=12&page=1&q=_exists_:record.details.tmpl_7C6B7370

Does not return records like this one:
https://api.oip.io/oip/o5/record/get/ce5f4406fd867c5eff635c1b9dc43c8753940da16e31b91ddbc9ccbab68d69e2

But it should.

[bitspill]

The exists query returns fields with non-null values

https://www.elastic.co/guide/en/elasticsearch/reference/6.8/query-dsl-query-string-query.html#_field_names

[daviortega]

right, so why it isn't showing up? Is the response changing null to {}?

[bitspill]

[] and {} are both also considered non-existent/null for the purposes of ES queries

[daviortega]

any suggestion on how to find all records that has a specific template even if it is empty? (null for ES)?