@Override
    public VespaConfigChangeAction modifyAction(String newMessage, List<ServiceInfo> newServices, String documentType) {
        return new VespaReindexAction(clusterId(), validationId, newMessage, newServices, documentType);
    }
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