Suggest values for a free-text search field

Type-ahead vocabulary for the free-text people filters — company, website, location, region, title, school, skill — the same suggestions the product's search UI offers. Send the returned name verbatim as the filter value; the values are lower-cased exactly as the provider stores them. The enum-backed fields are served in full by GET /prospects/filter-options instead. Only field=region rows carry countries, listing the countries that region name appears in, likeliest first, so identically named regions can be told apart. Free: no credits, no provider spend beyond the type-ahead call.

Errors:

• 422 VALIDATION_FAILED — The request failed the declared schema; param names the offending key and message quotes the rule it broke.
• 429 RATE_LIMITED — Per-token rate limit for this bucket exhausted; retry after the window in the RateLimit-Reset header.
• 500 UNEXPECTED_ERROR — The request failed inside the service; nothing was billed and the request_id identifies the failure.

Requires one of the following token scopes: search.