Should `TIMESTAMP` be required when publishing nightlies

There is a conflict between two parts of the process.
In the refactor release tool job it says `Optional timestamp to add for nightly builds.` against the description of the `TIMESTAMP` field
But if you try to run without a TIMESTAMP set the job says `Nightly must have a TIMESTAMP set`
Is it optional, or is it mandatory? Either way, the messages need to be consistent with each other.

Empieza localizando el refactor release tool job y la validación de TIMESTAMP mencionada en el issue. Compara la descripción del campo con el mensaje de error nightly y determina el requisito previsto; se considera terminado cuando la validación y las descripciones visibles para el usuario reflejan de forma coherente si TIMESTAMP es opcional u obligatorio.

Escrito por el modelo de indexación a partir del texto del issue.