[florent-leborgne]

Summary

Readers can reach the product hubs from the left nav. Elastic Stack is a nav group right after Elastic fundamentals. Its page is the group's landing page, and the Elasticsearch, Kibana, and Logstash hubs sit under it.

Relates to docs-content-internal#1561.

• docset.yml: replaces the four hidden: hub entries with - toc: products, placed right after get-started. deploy-manage also moves up to follow products, to match the order in the docs-builder navigation.yml.
• products/toc.yml: removes the "not loaded yet" comment. elastic-stack.md is the first entry, so it becomes the group's page. The three product hubs follow as its children.

This PR is stacked on #7964, so its base is docs-hub-pages-v1. GitHub retargets it to main when #7964 merges.

Merge order

1. #7964 adds the hub pages.
2. This PR loads toc: products in the docset.
3. elastic/docs-builder#4477 adds the group to the assembled left nav.

Merge docs-builder#4477 last. It fails the assembler build check until step 2 lands, because the assembler builds the nav against the default branch of this repo.

Test plan

• In the preview, the left nav shows Elastic Stack right after Elastic fundamentals
• Elastic Stack expands to Elasticsearch, Kibana, and Logstash
• Deploy and manage follows Elastic Stack
• /products/elastic-stack, /products/elasticsearch, /products/kibana, and /products/logstash still resolve
• Elastic Stack appears once in the nav, not nested inside itself

Screenshots to add or update

None added. The left nav gains one group, so check it in the preview.

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: Cursor, Claude Sonnet 5.5 (nav change and PR description)

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