CPS for transforms

[shainaraskas]

Summary

Documents cross-project search (CPS) scope for transforms on Elastic Cloud Serverless, and adds Transforms to the CPS availability table. Defers to the core CPS pages for shared concepts.

Intended to merge once the transforms CPS feature is complete in Kibana.

bulk actions for CPS were skipped in this PR because no other bulk actions for transforms are explicitly documented

Changes

• transform-overview.md: New ## Cross-project search scope section (serverless: preview) covering how a transform stores its scope, the create-time defaults, changing scope, and the Project scope column.
• cross-project-search-manage-scope.md: Adds Transforms to the CPS availability table.
• ecommerce-transforms.md: Two tips linking to the new scope section.

Sources

• Figma: CPS Kibana GA revisions
• Merged Kibana work: [Transforms] Add CPS header control kibana#276014, [Transforms] Add source.project_routing schema plumbing kibana#276691, [Transforms] Add project routing information to expanded transform details kibana#277058, [Transforms] Add project scope column kibana#277247, [Transforms] Add project routing plumbing in create flow kibana#279833, [Transforms] Add CPS project scope field in create form kibana#283749
• Defers to core CPS docs: [CPS] Core CPS in ML AD content #7814, CPS scope selector changes #7815

Related

• Part of elastic/docs-content-internal#1405
• Merge gated on completion: [Transforms][CPS] Add project routing support to edit flyout kibana#283321 (edit flyout), [Transforms][CPS] Add bulk action support for project-routed transforms kibana#283322 (bulk)
• Tutorial follow-up: elastic/docs-content-internal#1626

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No
  Tool(s) and model(s) used: opus 4.8

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🔍 Preview links for changed docs

• explore-analyze/cross-project-search/cross-project-search-manage-scope.md
• explore-analyze/transforms/ecommerce-transforms.md
• explore-analyze/transforms/transform-overview.md

[github-actions]

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[ElenaStoeva]

Thanks for updating the docs @shainaraskas! Overall it looks good, I left a few small suggestions.

[ElenaStoeva]

Thanks for the changes @shainaraskas! Latest lgtm.
Do you mind waiting for elastic/kibana#285798 to be merged before you merge this PR?

[georgewallace]

Overall looks fantastic.. some just minor nits and suggestions for you to consider.