This file is indexed.

/usr/share/doc/pkg-components/examples/README.source is in pkg-components 0.6.

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

The actual contents of the file can be viewed below.

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This package is built using pkg-components. To download current
and latest upstream tarballs see the uscan-components script in that
package.

Note also that the binary copyright file is a merger of 
debian/components/copyright.in and debian/components/*/copyright.
Various Debian tools require a static file in debian/copyright.
If for some reason the generated copyright file changes
copy from debian/$PACKAGE.copyright to debian/copyright after a build.