[simonw]

There is a way of running disk-backed FAISS indexed that don't all fit in memory but I've not quite figured out how to do that yet: https://github.com/facebookresearch/faiss/issues/2675

[jamesblonde]

OpenSearch K-NN plugin supports FAISS and it's disk based:

https://opensearch.org/docs/latest/search-plugins/knn/index/

[uh_uh]

OpenSearch looks like the best so far, all my requirements combined!