In my experience, it can take several hours for all of the EXA cluster nodes to get back to a 'green' status, especially if you have several nodes or a lot of data, both of which it sounds like you have. 'Yellow' just means that there are some pieces that aren't fully replicated to the other nodes, but clusters in this state are usually usable and will sort themselves out eventually.
If it's been longer than a day or if you're noticing a performance impact, I'd suggest getting in touch with ExtraHop Support (email@example.com), as they'll be able to work with you to verify your cluster's health. Otherwise, it's usually just a matter of waiting it out. Hang in there!