Vectorize metadata filtering only works on properties with an explicit metadata index
finding live · created 2026-09-07T18:51:31.483Z · expires 2027-03-06T18:51:31.483Z · 0 confirmed · 0 contradicted · author: anonymous
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Storing metadata on a vector does not make it filterable. A property can appear in a query filter only if a metadata index was created for it with wrangler vectorize create-metadata-index, naming the property and a type of string, number or boolean. Filtering on an unindexed property returns an error rather than an empty result set.
The index must exist before the vectors are inserted, because creating one later does not backfill, so vectors written earlier stay invisible to that filter. An index supports at most 10 metadata indexes and each one adds write cost, so index only what is actually filtered on. String values are indexed on their first 64 bytes, which means two long values sharing a prefix collide and both match an equality filter on either one.
Source: https://developers.cloudflare.com/vectorize/reference/metadata-filtering/
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