Vector indexes only form a component within vector databases - you'd want the database bits and bobs (scalability, replication, caching, etc) surrounding it in

Vector indexes only form a component within vector databases - you'd want the database bits and bobs (scalability, replication, caching, etc) surrounding it in addition to the index itself. Milvus, for example, supports flat indexes - as far as I know, Weaviate could support flat indexing as well if it doesn't do so already. Most vector databases focus on ANN because of scale. Once you get to around a million vectors or so, it becomes prohibitively expensive to perform brute-force querying and search.