This file is indexed.

/usr/share/unattended-upgrades/20auto-upgrades-disabled is in unattended-upgrades 0.83.3.2+deb8u1.

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

The actual contents of the file can be viewed below.

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APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Unattended-Upgrade "0";