public static VespaReindexAction of(ClusterSpec.Id id, ValidationId validationId, String message) {
        return new VespaReindexAction(id, validationId, message, List.of(), /*documentType*/null);
    }
The name of this action, which must be a valid ValidationId. This is a string here because
the validation ids belong to the Vespa model while these names are exposed to the config server,
which is model version independent.
config-model/src/main/java/com/yahoo/vespa/model/application/validation/change/VespaReindexAction.java