This file is indexed.

/etc/etckeeper/pre-install.d/README is in etckeeper 0.61ubuntu2.

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

The actual contents of the file can be viewed below.

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Files in this directory are run before packages are installed, upgraded,
etc. This is mostly used for sanity checks, ie, does /etc have any
uncommitted changes?