Using stored_fields for retrieving a subset of the fields

Elastic Stack Elasticsearch
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The documentation and recommendation for using stored_fields feature in ElasticSearch has been changing. In the latest version, stored_fields is not recommended - https://www.elastic.co/guide/en/elasticsearch/reference/7.9/search-fields.html
Is there a reason for this?

Where as in version 7.4.0, there is no such negative recommendation - https://www.elastic.co/guide/en/elasticsearch/reference/7.4/mapping-store.html

What is the guidance in using this feature? Is using _source filtering a better option? I ask because in some other doc, _source filtering is supposed to kill performance - https://www.elastic.co/blog/found-optimizing-elasticsearch-searches

What is the best way to filter fields and not kill performance?

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The documentation has only been updated for the most recent release (and also moved around), using source is recommended there as well. So is upgrading from 7.4 to 7.9 :slight_smile:

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