This file is indexed.

/etc/kernel/postinst.d/pm-utils is in pm-utils 1.4.1-17.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

# Let programs know not to hibernate if the kernel that would be used for
# resume-from-hibernate is likely to differ from the currently running kernel.
touch /var/run/do-not-hibernate