Cloned from launchpad blueprint https://blueprints.launchpad.net/heat/+spec/implement-aws-updates-not-supported. Description: As Heat tries to maintain compatibility of its AWS resources, a user can expect that a template using Heat's AWS compatible resources will work the same both on Heat and on AWS. Currently though we are missing a specific behavior of some AWS resources on stack update - a property of resource might not support any updates, including UpdateReplace (that is currently our default update behavior). Specification URL (additional information): https://review.openstack.org/#/c/105742