This file is indexed.

/etc/mysql/debian-start is in mysql-server-5.7 5.7.21-1ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/bash

# Change to no-op as detailed in
# https://bugs.launchpad.net/ubuntu/+source/mysql-5.7/+bug/1577712
exit 0