[9.5] [Lens] Assert truncate formatter contract instead of pinning top value (#288956) - #290653
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elastic#288956) Fixes elastic#287650 ### Summary - The `keyword formatters > should display truncate string formatter correctly` test failed with `expected 'ant...' to sort of equal 'dal...'`. - The datatable is a `Top 9 values` terms aggregation over a runtime field emitting `links.raw`, spanning a 3-shard `logstash-*` data view. Multi-shard terms aggregations are approximate, so when candidate values are tightly clustered in count the #1 slot flips between runs (`dal...` vs `ant...`) — both are valid truncations. - This patch asserts the truncation *contract* (3 chars + `...`) via `/^.{3}\.\.\.$/` instead of pinning a specific top value, since the `TRUNCATE` formatter — not which value ranks first — is what this test verifies. ### Context - Follows the fix proposed by the [Failed Test Investigator](elastic#287650 (comment)): the returned cell was a valid truncation, so the formatter rendered correctly; only the non-deterministic underlying top value changed. This is expected Elasticsearch behavior, not a product or timing bug. - The new assertion still fails if truncation regresses (wrong length or missing ellipsis), so formatter coverage is preserved. `.match(RegExp)` is supported by `@kbn/expect`. - Failed twice on `kibana-on-merge` (main) — the local pipeline, not Cloud-specific — consistent with a data/assertion issue rather than an environment one. <details> <summary>Verification</summary> #### Verified locally ✅ Passed: `node scripts/eslint x-pack/platform/test/functional/apps/lens/group2/field_formatters.ts` #### Not verified locally - This is an FTR test requiring a live Elasticsearch + Kibana, which cannot be run in this environment. Its CI covers the change once the PR is open. </details> > [!NOTE] > Share feedback in #kibana-qa. Mention `@copilot` to make quick changes. > Generated by [Flaky Test Fixer](https://github.com/elastic/kibana/actions/runs/33747031300) for elastic#287650 · opus · 156.2 AIC · ⌖ 38 AIC · ⊞ 12.8K · [◷](https://github.com/search?q=repo%3Aelastic%2Fkibana+%22gh-aw-workflow-id%3A+flaky-test-fixer%22&type=pullrequests) <!-- gh-aw-agentic-workflow: Flaky Test Fixer, engine: claude, version: 2.1.165, model: opus, id: 33747031300, workflow_id: flaky-test-fixer, run: https://github.com/elastic/kibana/actions/runs/33747031300 --> <!-- gh-aw-workflow-id: flaky-test-fixer --> <!-- gh-aw-workflow-call-id: elastic/kibana/flaky-test-fixer --> Co-authored-by: Claude Opus 4 (1M context) <noreply@anthropic.com> Co-authored-by: Marco Vettorello <marco.vettorello@elastic.co> (cherry picked from commit dfab8ee)
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