Use Elasticsearch 9.5.4 for Aspire development

[ejsmith]

Summary

Run Aspire development and its backend-test infrastructure on the published exceptionless/elasticsearch:9.5.4 image with mapper-size, and use matching Kibana 9.5.4. This enables local application validation before upgrading the deployed dev cluster.

Use exceptionless.data.v2 so starting Aspire preserves the existing 8.x volume instead of upgrading its data directory in place. The volume version increments for breaking data changes. Existing local data is not migrated automatically. No application API, client-library, index-schema, Compose, or deployed-cluster configuration changes.

Compatibility and release review

• The existing Elasticsearch 8.19 client uses the 8-to-9 REST compatibility bridge. Existing data requires Upgrade Assistant and a pre-upgrade snapshot; upgraded data directories cannot be downgraded. Release-date ordering rules out 8.19.22 → 9.5.4 (September 23 → September 15). The fresh local volume avoids that unsupported path; deployed dev is still on 8.19.15.
• Reviewed Elasticsearch breaking changes, known issues, and Kibana's breaking changes and known issues. The 9.5.0–9.5.2 bulk-indexing defect is fixed in this version. Local Aspire uses no custom S3, EC2 discovery, or Kibana email-proxy configuration.
• 9.5.4 includes the fix for ESA-2026-179 / CVE-2026-94398. This is a release/advisory review, not a complete image vulnerability scan.

Verification

• Published image manifest includes Linux AMD64 and ARM64.
• Local Elasticsearch reports 9.5.4 with mapper-size 9.5.4 using a fresh volume; Aspire reports Elasticsearch, Kibana, and the API healthy. Runtime checks preceded the final volume-name correction to exceptionless.data.v2; that correction was verified statically.
• Hosted Build at d7afc72c: all four backend shards and test-api, all six browser shards and test-e2e, test-client, and Docker build passed.
• Full local backend run on 9.5.4: 3,086 passed, 3 opt-in tests skipped, 4 failed. The same four failures reproduce from the existing main checkout: one Windows CRLF OpenAPI-description mismatch and three source-map file-storage tests. Hosted Linux CI passes these tests; no unrelated test/source changes are included.

Breaking changes

No public API changes. Local Aspire starts with fresh Elasticsearch data; the previous exceptionless.data.v1 volume remains available for 8.x.

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-04T22:31:24.434819Z	b9dc2e9	New commits

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Reviewed commit: 5143fea498

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[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Exceptionless.AppHost	23%	23%	128	❌
Exceptionless.Core	77%	68%	10825	✔
Exceptionless.Insulation	51%	43%	370	➖
Exceptionless.Web	86%	70%	9173	✔
Summary	80% (27814 / 34875)	69% (13749 / 20064)	20496	✔