chore: replace metadata w meta in tests/examples

[anakin87]

Related Issues

• fixes https://github.com/deepset-ai/haystack/actions/runs/7287648714/job/19859015505

Proposed Changes:

• this is a quick fix to make the CI green again
• however, Change metadata to meta #6570 is not complete. I'm reopening it

How did you test it?

CI

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[julian-risch]

@anakin87 Don't exclude the fix for the e2e tests:

haystack/e2e/pipelines/test_rag_pipelines.py

Line 38 in 3d17e6f

rag_pipeline.connect("llm.metadata", "answer_builder.metadata")

The rag pipeline test shouldn't be broken at the moment. It's just the extractive qa pipeline that I need to update.

[anakin87]

@anakin87 Don't forget e2e tests:

haystack/e2e/pipelines/test_rag_pipelines.py

Line 38 in 3d17e6f

rag_pipeline.connect("llm.metadata", "answer_builder.metadata")

I excluded them because they seem already broken for other reasons: https://github.com/deepset-ai/haystack/actions/runs/7287945256/job/19859716787

I would say we should fix them but not in this quick PR to make the CI green again

[julian-risch]

I'd suggest including the fix to rag_pipeline.connect("llm.metadata", "answer_builder.metadata") in this PR here. I understand that it triggers the e2e tests to run, which then fail due to the other issue. We could still merge the PR though. And I will fix the extractive qa e2e test by the end of the day.

[anakin87]

@julian-risch it makes sense.
I did not know that e2e tests are not required to merge.
Now I have made this change.

I assigned you as reviewer.

[julian-risch]

LGTM! 👍 Good call to reopen the issue. I also see a couple of more places where .metadata is still used.