[Internal]: Document time-series querying in ES|QL

[kkrik-es]

Description

We're adding support for querying time-series data in ESQL using the TS source. The semantics are different, compared to regular aggregations under FROM, as explained in the following page:

https://github.com/elastic/metrics-program/blob/main/docs/tsdb%2B%2B/esql-time-series-syntax.md

This is slotted for v.9.1 but we want to expose it in serverless earlier, ideally in the next 2 weeks. There's relevant support in Kibana that will also need to be documented, so this is somewhat relevant to #2827 - @stratoula fyi, in case there's another relevant issue.

Resources

The following page contains some relevant information, as mentioned:

https://github.com/elastic/metrics-program/blob/main/docs/tsdb%2B%2B/esql-time-series-syntax.md

Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

Feature differences

N/A

What release is this request related to?

9.2

Serverless release

The week of September 29, 2025

Collaboration model

The documentation team

Point of contact.

Main contact: @kkrik-es

Stakeholders: @stratoula @felixbarny @dnhatn

[kkrik-es]

This is time-critical, I'm happy to help with providing content and consulting as needed.

[leemthompo]

@kkrik-es as you're the SME and this is time-critical, would you like to drive the docs drafting and docs team can help review for language and help unblock any issues with the docs system?

the ESQL docs source files live here: https://github.com/elastic/elasticsearch/tree/main/docs/reference/query-languages/esql

[kkrik-es]

Sounds good, would it make sense to get a dedicated point of contact from the docs team to help with questions and reviews? Thanks.

[leemthompo]

Awesome thanks @kkrik-es — you can tag @elastic/developer-docs — me and @marciw will be the POCs. Otherwise, if something super urgent needs attention you can ping me directly.

In terms of Slack channels, If you have ESQL docs automation questions can ask in #esql-project-team, but if it's a docs-specific question can use #docs

[kkrik-es]

Addressed in elastic/elasticsearch#134373