[BUG] ml/models/upload.yaml is flaky

[dblock]

What is the bug?

ERROR   ml/models/upload.yaml (tests/plugins/ml/ml/models/upload.yaml)
    ERROR   EPILOGUES
        ERROR   GET /_plugins/_ml/tasks/{task_id} (Expected to find non undefined value at `payload.model_id`.)
        PASSED  DELETE /_plugins/_ml/models/{model_id}

How can one reproduce the bug?

https://github.com/opensearch-project/opensearch-api-specification/actions/runs/12698838167/job/35398176121

What is the expected behavior?

Tests to always pass.

What is your host/environment?

GHA

Do you have any additional context?

Logs: https://github.com/opensearch-project/opensearch-api-specification/actions/runs/12698838167/artifacts/2409815593

[dblock]

@nathaliellenaa care to take a look please? this happens often :(

[nathaliellenaa]

Definitely, I'll take a look!