default DeploymentSpec parseDeploymentSpec(boolean validate) {
         return getDeployment()
                   .map(new DeploymentSpecXmlReader(validate)::read)
                   .orElse(DeploymentSpec.empty);
    }
Returns the parsed deployment spec of this,
without validating it, and without reparsing on each request.
config-model-api/src/main/java/com/yahoo/config/application/api/ApplicationPackage.java