Instruction: Describe how you would debug a retrieval regression caused by metadata changes.
Context: Tests how the candidate diagnoses the problem, chooses the safest next step, and reasons through recovery. Describe how you would debug a retrieval regression caused by metadata changes.
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I would trace the request with filter values at every stage. When metadata filters silently exclude the best documents after a schema change, the bug is usually a mismatch between application expectations, indexed field names, and stored values rather than a ranking problem.
I would compare...
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