This file is indexed.

/lib/systemd/system/proc-xen.mount is in xe-guest-utilities 6.2.0-1120+dsf1-0ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Unit]
Description = Xen ProcFS
Before=xe-daemon.service
DefaultDependencies=no
ConditionVirtualization=xen

[Mount]
What = none
Where = /proc/xen
Type = xenfs

[Install]
WantedBy=local-fs.target