This file is indexed.

/etc/terminfo/README is in ncurses-base 6.0+20161126-1+deb9u2.

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 directory is for system-local terminfo descriptions. By default,
ncurses will search ${HOME}/.terminfo first, then /etc/terminfo (this
directory), then /lib/terminfo, and last not least /usr/share/terminfo.