Should we make `_ignored` retrievable via `fields`?

[cbuescher]

We started adding metadata field like _size and _doc_count (#70575) or
the new _tier field (#71379) to the list of metadata retrievable via the fieldsAPI.
We might also want to add the _ignored field here, which currently doesn't support fetching via fields, but it might make
sense in light of issues like #74121 to add this.

[elasticmachine]

Pinging @elastic/es-search (Team:Search)

[jtibshirani]

If a document has any ignored fields, the search hit always contains a section "_ignored": [ "field1", "field2", ...]. Would support for loading _ignored through fields bring additional benefit?

[jimczi]

I agree with Julie, the _ignored section that is returned in search hit is not optional. It is always there if the hit has ignored fields. We should make sure that this section covers every case (#74228) but it's not part of the fields option. It's a feature of the search that guarantees that these fields are always visible in search responses.

[cbuescher]

Makes, sense, thanks for the quick feedback. I will close this issue then.