This file is indexed.

/usr/share/bug/gnupg/presubj is in gnupg 1.4.18-7+deb8u5.

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

The actual contents of the file can be viewed below.

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Please consider reading /usr/share/doc/gnupg/README.BUGS.Debian.gz before
sending a bug report. Maybe you'll find your problem there.