A lot can happen during a migration, for example, we could somehow mess up our original (ES6) cluster. Luckily, even if we do, it's not the end of the world. We can always restore the cluster from a snapshot.
I've already written about doing that on ES8, since we keep taking that whole cluster down. This post is the same idea, only for ES6, in case we need to do that during the migration. But if you're not sure what a snapshot is, or how it helps, please skim through that previous post - it's already there.
We have a regularly-running snapshot creation job for ES6, that runs weekly on both crawldb prod and trackdb prod. We may be running it on a different schedule during the migration, but either way, we wil