[anarkafkas]

Thank you! Yes, that's correct. The limit for a batch migrator must be 500 because it uses Firestore write batches internally.

I'm currently writing another migrator that won't be using Firestore batches, it'll just use the good old Promise.all(). I'm planning to add more capabilities soon like error-resilient traversers using different traversal strategies, the ability to re-traverse the docs that couldn't be migrated the first time etc.