This file is indexed.

/etc/aptitude-robot/triggers.post/README.txt is in aptitude-robot 1.4-1.

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

The actual contents of the file can be viewed below.

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Scripts in this directory are executed after aptitude is run.  Files with
periods in their name are ignored.  If in doubt do not place a script here.
It would be executed every time aptitude-robot is run.