Google apps script - Rhino runtime no longer supported

One of our google apps scripts started showing "Execution failed. The Rhino runtime is deprecated and no longer supported."

We needed to migrate the google apps script to V8, based on this - 

https://developers.google.com/apps-script/guides/v8-runtime/migration

Once that was done and the script was re-deployed with v8 runtime changes, the script was working again.