Update elastic search cookbook to use latest API

[robtinn]

Summary

Upgrade completions API to responses API.

Motivation

I was working through elastic search integration with OpenAI and upgrading this to Responses would be greatly beneficial to many teams.

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[pap-openai]

Looks good (new embeddings/SDK) but is this using the new Response API? I don't see any model responses/completions but might have miss them

Also we might want to not update the date as it'll show up as new content and I think the original post date is more important than updated one, we could maybe have an optional field for updated_date to reflect this in the future but will require some updates on the website (cc @lspacagna-oai)

[pap-openai]

wouldn't change it

[robtinn]

Looks good (new embeddings/SDK) but is this using the new Response API? I don't see any model responses/completions but might have miss them

Also we might want to not update the date as it'll show up as new content and I think the original post date is more important than updated one, we could maybe have an optional field for updated_date to reflect this in the future but will require some updates on the website (cc @lspacagna-oai)

Good point pap about having an optional field. I put up a draft PR for the website for this, let me know if you have any thoughts.