Docs note an example, but they do not tell what the name parameter should be...

I guessed for example that to move from one stuck with an error in warm/shrink to delete, I would need to do this:

POST _ilm/move/test-index
{
  "current_step": { 
    "phase": "warm",
    "action": "shrink",
    "name": "ERROR"
  },
  "next_step": { 
    "phase": "delete",
    "action": "delete",
    "name": "delete"
  }
}

But it took me a while because given the existing example I presumed that it would be "name":"shrink" not "name":"ERROR".