ES|QL: Enable score function in release builds

[ioanatia]

This enables the score function in release builds.
The score function can be used to retrieve the score of individual queries, which is helpful for applying custom scoring formulas or for debugging / score explainability.

[elasticsearchmachine]

Hi @ioanatia, I've created a changelog YAML for you.

[github-actions]

🔍 Preview links for changed docs

• docs/reference/query-languages/esql/functions-operators/search-functions.md

[github-actions]

ℹ️ Important: Docs version tagging

👋 Thanks for updating the docs! Just a friendly reminder that our docs are now cumulative. This means all 9.x versions are documented on the same page and published off of the main branch, instead of creating separate pages for each minor version.

We use applies_to tags to mark version-specific features and changes.

Expand for a quick overview

When to use applies_to tags:

✅ At the page level to indicate which products/deployments the content applies to (mandatory)
✅ When features change state (e.g. preview, ga) in a specific version
✅ When availability differs across deployments and environments

What NOT to do:

❌ Don't remove or replace information that applies to an older version
❌ Don't add new information that applies to a specific version without an applies_to tag
❌ Don't forget that applies_to tags can be used at the page, section, and inline level

🤔 Need help?

• Check out the cumulative docs guidelines
• Reach out in the #docs Slack channel

[elasticsearchmachine]

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

[elasticsearchmachine]

Pinging @elastic/kibana-esql (ES|QL-ui)

[ioanatia]

@stratoula enabling the score function means that we also change the validation rules for the search functions like match.

these can now be used in EVALs, as arguments of the score function, e.g.:

FROM books
| EVAL my_score = score(match(title, "Rings") and ratings > 4.6)

[stratoula]

@ioanatia here is our PR elastic/kibana#240933. Let me know when to merge

[carlosdelest]

Don't we need to update rest-api-spec/test/esql/60_usage.yml as well to ensure we're tracking telemetry? 🤔

[tteofili]

LGTM, thanks @ioanatia

[ioanatia]

Don't we need to update rest-api-spec/test/esql/60_usage.yml as well to ensure we're tracking telemetry? 🤔

It's better to be sure so I have run the release tests and they pass - so I think it's not needed.