This file is indexed.

/usr/src/glibc/debian/changelog.upstream is in eglibc-source 2.19-0ubuntu6.

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

The actual contents of the file can be viewed below.

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The upstream changelog being composed of multiple files with a total size
of more than 1.5MB, they are provided by the glibc-doc package in the
/usr/share/doc/glibc-doc/ directory.