fix: use docstore.index for get_metadata_values_by_key (OpenSearch / elasticsearch)

[tstadel]

Related Issues

All docstore methods normally take self.index as index param of opensearch / elasticsearch requests if no value for index has been passed explicitly. get_metadata_values_by_key misses this behavior.

Proposed Changes:

• get_metadata_values_by_key uses self.index if index=None
• batch_size param added to get_metadata_values_by_key to controll efficient paging

How did you test it?

• existing tests
• additional test for batch_size

Notes for the reviewer

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

[vblagoje]

Looks good, would you please generate schema and verify if this change will be reflected there properly, just to make sure we don't get any hiccups when releasing :-)

[tstadel]

Looks good, would you please generate schema and verify if this change will be reflected there properly, just to make sure we don't get any hiccups when releasing :-)

@vblagoje this change doesn't make schema changes. We only add the param to method get_metadata_values_by_key but not to the component's init.