This file is indexed.

/lib/systemd/system-preset/90-libreswan.preset is in libreswan 3.23-4.

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

The actual contents of the file can be viewed below.

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# Libreswan IPSec daemon needs to be configured before enabling.
# See /usr/share/doc/libreswan/README.Debian for details.
disable ipsec.service