Approximate k-NN with pre-filter

Hello Team,

Is it possible to use a pre-filter (on a keyword field for example) and then do approximate k-NN on the remaining documents so that I always get back exactly k documents? The documentation mentions a pre-filter together with custom scoring, but not with approximate k-NN. I guess I could try it, but I wanted to ask first, and if it’s possible then the documentation should mention that.

Thanks for Open Distro by the way!