[ES|QL] Enable the TEXT_EMBEDDING function in non-snapshot build

[afoucret]

No description provided.

[elasticsearchmachine]

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

[elasticsearchmachine]

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

[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

[github-actions]

🔍 Preview links for changed docs

• docs/reference/query-languages/esql/functions-operators/dense-vector-functions.md
• docs/reference/query-languages/esql/kibana/docs/functions/text_embedding.md

[Copilot]

Pull Request Overview

This pull request enables the TEXT_EMBEDDING function in non-snapshot builds of Elasticsearch, moving it from development-only to general preview availability. The function generates dense vector embeddings from text using inference endpoints.

Key changes:

• Moved TEXT_EMBEDDING function from snapshot-only to general availability
• Updated function registration and capability flags
• Removed capability checks from tests and made function always available
• Enhanced documentation with additional examples and clearer descriptions

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
EsqlCapabilities.java	Removed snapshot-only restriction from TEXT_EMBEDDING_FUNCTION capability
EsqlFunctionRegistry.java	Moved TEXT_EMBEDDING function from snapshot functions to general functions
TextEmbedding.java	Updated function metadata and lifecycle from DEVELOPMENT to PREVIEW
Multiple test files	Removed capability checks that were gating TEXT_EMBEDDING function tests
Documentation files	Updated function descriptions and added new usage examples
60_usage.yml	Added TEXT_EMBEDDING function usage tracking in REST API tests
text-embedding.csv-spec	Updated example tags for consistency
changelog/136103.yaml	Added changelog entry for the feature

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

The method signature was changed to remove the throws IOException declaration, but StreamOutput.write* methods can throw IOException. This could cause compilation errors if the method implementation actually tries to write to the stream.

Suggested change

	public void writeTo(StreamOutput out) {
	public void writeTo(StreamOutput out) throws java.io.IOException {

[carlosdelest]

👍

[leemthompo]

Looks great already :)

[leemthompo]

LGTM once regenerate the docs :) Thanks @afoucret!

I noticed one unrelated change that should also be fixed in parameters:

- Text to generate embeddings from
+ Text string to generate embeddings from.

[afoucret]

@leemthompo Applied most of your suggestions.
Also I updated the example description if you can have a look.