feat: add closing methods to components that hold Document Stores

[anakin87]

Related Issues

• related to Document Store - closing resources haystack-core-integrations#1628: we have been adding closing methods to Document Stores (and specific retrievers).

Proposed Changes:

• Implement closing methods for components that support multiple Document Stores
  • they delegate to the Document Store if it has closing methods
  • otherwise, they do nothing

How did you test it?

CI, new tests

Checklist

• I have read the contributors guidelines and the code of conduct.
• I have updated the related issue with new insights and changes.
• I have 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: and added ! in case the PR includes breaking changes.
• I have documented my code.
• I have added a release note file, following the contributors guidelines.
• I have run pre-commit hooks and fixed any issue.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
haystack-docs	Ignored	Preview	Jul 27, 2026 4:15pm

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
haystack/components/caching
cache_checker.py
haystack/components/retrievers
auto_merging_retriever.py
filter_retriever.py
sentence_window_retriever.py
haystack/components/writers
document_writer.py
Project Total

This report was generated by python-coverage-comment-action

[sjrl]

Looks good!