This file is indexed.

/usr/share/build-essential/essential-packages-list is in build-essential 12.4ubuntu1.

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

The actual contents of the file can be viewed below.

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This list was generated on Mon Sep 18 16:35:22 UTC 2017 for amd64
It contains a list of essential packages (which are also build-essential).

base-files
base-passwd
bash
bsdutils
coreutils
dash
debianutils
diffutils
dpkg
e2fsprogs
findutils
grep
gzip
hostname
init-system-helpers
libc-bin
login
ncurses-base
ncurses-bin
perl-base
sed
sysvinit-utils
tar
util-linux