S3 Vectors Now Filters Before It Searches: Metadata Pre-Filtering for Multi-Tenant RAG

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If you run RAG on Amazon S3 Vectors with metadata filters, you may have been losing results without knowing it. Ask for the 10 nearest chunks for one tenant and you might get 3 back, or 10 that aren't actually the closest ones in that tenant's data. No error, no alarm, just a model answering with less context than it should have had. On September 30, 2026, AWS shipped metadata pre-filtering for S3 Vectors. Indexes now come in two modes, and the new one evaluates your filter before the similarity search instead of during it.

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