Plan a vector index migration with reversible cutover and retrieval validation.
Migration plan A new embedding model promises better retrieval, but the proposed migration overwrites the only production vector collection. If retrieval degrades, the team cannot quickly return to known-good behavior. Blue-green retrieval Build green beside blue Treat the vector index as deployable infrastructure. Prepare the new version beside the old one and switch traffic only after validation. Overwrite Fast until rollback is needed. Retrieval changes become reversible release changes. Cut over by switching traffic, not by destroying the previous path. 01 Build 02 Cutover 03 Fresh Build the candidate Decision 1
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