Redis provides indexes for vector similarity. And we have a lot of experience with Redis. We see a future where we can offer more than one datastore, and we’ve been considering Qdrant as the next datastore to support.
You should look at Lucene core - they have incorporated vector embeddings in 9.4.x and it could provide you better scale than Redis with durability as well.
https://lucene.apache.org/core/9_4_2/demo/index.html