Add autocomplete search endpoint to API docs

[mintlify-development]

Summary

• Added new autocomplete search endpoint (POST /v1/search/{domain}/autocomplete) to the Discovery API documentation
• Created documentation pages for the endpoint in all languages (EN, FR, ES, ZH)
• Updated navigation to include the new autocomplete search page in the Assistant API reference section

This endpoint enables search-as-you-type experiences with optimized results grouped by page.

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Note

Low Risk
Low risk documentation-only changes (new MDX pages, OpenAPI spec entries, and navigation updates) with no runtime behavior modified.

Overview
Adds documentation for a new Discovery API endpoint, POST /v1/search/{domain}/autocomplete, including request/response schema details (query, optional filters, and extend_results) in each locale’s discovery-openapi.json.

Introduces new api/assistant/autocomplete.mdx pages for EN/ES/FR/ZH and updates docs.json navigation to surface the new Autocomplete page under the Assistant API reference.

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