This file is indexed.

/etc/apt/apt.conf.d/70debconf is in debconf 1.5.56+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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// Pre-configure all packages with debconf before they are installed.
// If you don't like it, comment it out.
DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt || true";};