This file is indexed.

/usr/lib/ssl/misc/c_issuer is in openssl 1.0.2g-1ubuntu4.15.

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
#
# print out the issuer
#

for i in $*
do
	n=`openssl x509 -issuer -noout -in $i`
	echo "$i	$n"
done