Below works and the data model is published.
Data Model Version - 1
type Employee @view(version: "1"){
name: String
}
Next step
Below doesn't work and I get an error "Can not change the nullability of the property\n We do not support modifying a field's 'required'ness at the moment."
Data Model Version - 2
type Employee @view(version: "2"){
name: String!
}