Hello,
Same issue as the others above on a fresh install. It seems for some reason you need to change the ./es folder to 777 to get the es container to write to it.
Access the Unraid CLI and enter:
chmod -R 777 /mnt/user/appdata/TubeArchivist/es
I noticed a large java file permissions error in the ES container logs the first few times i tried to start it. It would die right away, so you couldn't login to it.