v0.9.0

Quickwit 0.9.0 makes Ingest V2 the default and delivers a broad set of search, observability, and deployment improvements.

### Highlights

- Ingest V2 now powers the existing `/api/v1/{index}/ingest` endpoint by default.
- Searchers can offload leaf-search work to AWS Lambda.
- New Jaeger v2 support, Trino-compatible Elasticsearch endpoints, composite aggregations, and an SQS source.
- Optional mTLS validation for the REST API and a dedicated health-check HTTP server.
- Numerous control-plane, storage, search scheduling, performance, and security fixes.

> [!NOTE]
> The Parquet metrics and DataFusion work in the source tree is an early prototype. It is not built into the v0.9.0 binaries or Docker images and is not a supported 0.9.0 feature.

> [!IMPORTANT]
> Before upgrading from 0.8.x, back up the metastore. Quickwit 0.9 migrates it on first write; rollback requires restoring that backup.

See the [upgrade guide](https://github.com/quickwit-oss/quickwit/blob/v0.9.0/docs/get-started/upgrade.md) and the [full changelog](https://github.com/quickwit-oss/quickwit/blob/main/CHANGELOG.md#090).