Starting in 2.6.0
MongoDB version 4.0 is no longer supported. For Docker Compose, MongoDB version 4.2 is installed and upgraded automatically. For Kubernetes and OpenShift installations, you need to install or upgrade MongoDB to a supported version separately.
OpenShift installation using service template is no longer supported and removed from installer. You can migrate your OpenShift installation to Helm charts during your upgrade to version 2.6.0. or later. For more information, see this page. For assistance with migration, contact support.