This file is indexed.

/etc/dpkg/shlibs.override is in dpkg-dev 1.19.0.5ubuntu2.

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

The actual contents of the file can be viewed below.

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# dpkg shlibs override file
#
# Entries in this file will override all others, only use if you
# are really sure that is what you want!
# 
# For more information see the dpkg-shlibdeps(1) manual page. 
#
# <library name>	<version/soname>	<dependencies>