This file is indexed.

/etc/ld.so.conf.d/x86_64-linux-gnu.conf is in libc6 2.19-18+deb8u10.

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

The actual contents of the file can be viewed below.

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# Multiarch support
/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu