Cross Cluster Search Between ES Xpack and ODES

Has anyone tested cross cluster search between a licensed Xpack secured cluster and a Open Distro Elasticsearch?

I’m attempting to get this to work. So far I seem to have run into a CA trust issue between the two Elasticsearch clusters. I have different CA’s on the two clusters. The documentation seems to indicate that you can provide a list of approved CA’s but I haven’t been able to get that to work.