This file is indexed.

/etc/aptitude-robot/pkglist.d/README.txt is in aptitude-robot 1.5.2-1.

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

The actual contents of the file can be viewed below.

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Place package lists in this directory.  Files with periods in their name are
ignored.  If no package list file is placed here, aptitude-robot will perform
`aptitude install ~U`.