How to install GRUB2 after a RHEL6 to RHEL7 upgrade with redhat-upgrade-tool

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Issue

I used redhat-upgrade-tool to upgrade a RHEL 6 machine to RHEL 7 (following the instructions in How do I upgrade from Red Hat Enterprise Linux 6 to Red Hat Enterprise Linux 7?), but after a successful upgrade, the bootloader is still the same old GRUBv1. How can I switch over to GRUBv2?

Environment

Red Hat Enterprise Linux 7

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