[Internal]: Add info about minimum ML node sizing requirements in security docs

[dhru42]

Description

What: In order to use ELSER, users must deploy it on an ML node to ensure that the model has enough resources. Given that security users also use ELSER, we should explicitly document this in our security docs. Otherwise, add a clear reference link to ELSER docs.

Resources

To use ELSER, the NLP model must be deployed in your Elasticsearch cluster. The minimum dedicated ML node size for deploying ELSER is 4 GB, with autoscaling recommended for dynamic resource adjustment.

Reference discussion: https://elastic.slack.com/archives/C05BAPPP5KP/p1747718012584609

Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

Feature differences

adding compute requirements references for users

What release is this request related to?

8.17

Serverless release

ASAP

Collaboration model

The documentation team

Point of contact.

Main contact: @dhru42

Stakeholders: @jamesspi

[szabosteve]

The information is already present at the top of the KB page, under the Requirements section.

Do you want to amend it or expand it with any further info? Thank you!

[szabosteve]

The required information is listed in the Requirements section on the page, as the screenshot above shows. I close this issue as completed. If there is an emerging requirement to add more information or highlight existing requirements, please feel free to reopen the issue and give more context.

[dhru42]

Could you add a note about autoscaling being recommended here too? I'm sorry about the delay in feedback.

[szabosteve]

@dhru42 Sure, I've added the note via #2188.