[Stack 9.1.0-SNAPSHOT] [nats] Failing test daily: system test: default (variant: v2) in nats.connection

- Stack version: 9.1.0-SNAPSHOT
- Package: nats
- Failing test: system test: default (variant: v2)
- DataStream: connection
- Owners:
- @elastic/obs-infraobs-integrations

Failure:
```
test case failed: one or more errors found in documents stored in metrics-nats.connection-15745 data stream: [0] field "nats.connection.id" is undefined
[1] field "nats.connection.ip" is undefined
[2] field "nats.connection.lang" is undefined
[3] field "nats.connection.last_activity" is undefined
[4] field "nats.connection.port" is undefined
[5] field "nats.connection.start" is undefined
[6] field "nats.connection.version" is undefined
```

First build failed: https://buildkite.com/elastic/integrations/builds/25611

Latest 5 failed builds:
- https://buildkite.com/elastic/integrations/builds/26282
- https://buildkite.com/elastic/integrations/builds/26355
- https://buildkite.com/elastic/integrations/builds/26362
- https://buildkite.com/elastic/integrations/builds/26374
- https://buildkite.com/elastic/integrations/builds/26405