Amazon S3 Vectors now supports metadata pre-filtering for higher recall on filtered searches

What happened

You can filter on attributes such as tenant, category, status, or time, and pre-filtering adds prefix matching with $startsWith for paths, URLs, and hierarchical keys. Filters evaluate before similarity search so scoped queries return more relevant results.

Each vector carries up to 2 KB of filterable metadata, and a single query provides support for up to 100 filter constraints. There is no additional cost, no re-ingestion, and no change to your queries.

Most applications never search a whole index. They search the part of it that belongs to a particular user, account, or category, and they express that scope as a metadata filter.

Key facts

• Each vector carries up to 2 KB of filterable metadata, and a single query — support: up to 100 filter constraints