This file is indexed.

/usr/lib/tmpfiles.d/passwd.conf is in passwd 1:4.5-1ubuntu1.

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

The actual contents of the file can be viewed below.

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# If a password operation is in progress and we lose power, stale lockfiles
# can be left behind.  Clear them on boot.
r! /etc/gshadow.lock
r! /etc/shadow.lock
r! /etc/passwd.lock
r! /etc/group.lock
r! /etc/subuid.lock
r! /etc/subgid.lock