Fix export content search to match titles only, ranked by relevance

[donnapep]

Problem

The Export Content tool's search field (Sensei LMS → Tools → Export Content) failed to find matching lessons/courses/questions. Fixes #8047.

Reported in #8047: searching for a lesson by title returned nothing even though it exists and is published.

PostTokenField fetched /wp/v2/{type}?search=…&per_page=20 with WordPress core's default date ordering and searched title + content + excerpt. So:

• Results were the newest 20 matches, not the best 20.
• Posts matching only in their body text consumed slots.
• A matching post older than 20 such posts fell outside the window and was unselectable.

Confirmed against learn.wordpress.org data: a search returned 20 lessons, none matching in their title, all newer than the intended target — which was a title match but never appeared.

Fix

When a search term is present, the suggestion fetch now:

• Adds search_columns[]=post_title — match titles only (this is a "pick a post by name" field; body matches shouldn't crowd it out).
• Adds orderby=relevance — rank by match quality instead of date, so a title match isn't pushed past the per_page cap.
• Raises the suggestion limit from 20 to 100 — relevance ordering alone still left broad matches unreachable (see below).

The first two are @wordpress/api-fetch query params — no server changes. search_columns is a WP core REST param since 6.5; Sensei requires 6.8, so it's always available. orderby=relevance is set only when searching, because WP core rejects it without a search param and the field fetches with no search term on mount.

Relevance ordering alone still wasn't enough. A broad term like "open so" matches 32 lessons; the intended title match ("What Is Open Source?") ranks ~27th, because titles that lead with the search terms score higher and equal scores fall back to date. With per_page=20 the match stayed outside the window, so the limit is raised to 100 to keep lower-ranked title matches reachable.

Testing

1. On a site with 20+ lessons, create a lesson whose title matches a term (e.g. "Open source basics") with an older publish date than 20+ other lessons that mention that term only in their body.
2. Sensei LMS → Tools → Export Content → select Lessons.
3. Search for the title term.
4. The lesson appears in the suggestions and is selectable.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR fixes the Export Content tool’s post-picker search (Sensei LMS → Tools → Export Content) so that suggestions are based on title matches only and are ranked by relevance, preventing older title-matching items from being pushed out of the limited suggestion window by newer body-text matches.

Changes:

• Update PostTokenField REST query to use search_columns[]=post_title (title-only search) when a search term is present.
• Add orderby=relevance (only when searching) so results are ranked by match quality instead of default date ordering.
• Add a unit test to ensure the initial empty-search request does not include orderby=relevance.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
assets/data-port/export/post-token-field.js	Adds title-only search + relevance ordering query params for REST suggestions when searching.
assets/data-port/export/post-token-field.test.js	Adds a regression test to ensure orderby=relevance is not requested without a search term.
changelog/fix-export-search-relevance	Documents the user-facing fix in a patch-level changelog entry.

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