STEPS TO CONVERT RHEL AS TO RHEL ES

* Identify the exact redhat-release version and architecture
e.g: #rpm -q --queryformat "%{NAME} %{VERSION} %{RELEASE} %{ARCH}\\n" redhat-release
redhat-release 4ES 9 x86_64

* Download the corresponding redhat-release package/rpm from satellite server(Important)
eg: redhat-release-4AS-9.x86_64.rpm should be replaced by redhat-release-4ES-9.x86_64.rpm

* Delete system profile from satellite sever

* Remove redhat-release package from the system
eg: #rpm -e --nodeps redhat-release

* Install download rpm package
eg: #rpm -Uvh redhat-release-4ES-9.x86_64.rpm

* Register the system with new activation key