chore: Revert addition of MultiFilterRetriever

[bogdankostic]

Proposed Changes:

This PR reverts the addition of the MultiFilterRetriever introduced in #11028. The component is redundant, given that the same can be achieved by embedding the list of filters in an OR filter clause and using the already existing FilterRetriever.

How did you test it?

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 have added unit tests and updated the docstrings.
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Project	Deployment	Actions	Updated (UTC)
haystack-docs	Ready	Preview, Comment	Apr 16, 2026 11:34am

[coveralls]

Coverage Report for CI Build 24507949236

Coverage decreased (-0.01%) to 92.844%

Details

• Coverage decreased (-0.01%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 2 coverage regressions across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

2 previously-covered lines in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
core/pipeline/async_pipeline.py	2	70.76%

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Coverage Stats

Relevant Lines:	17175
Covered Lines:	15946
Line Coverage:	92.84%
Coverage Strength:	0.93 hits per line

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💛 - Coveralls

[anakin87]

Thank you!

🧹