This file is indexed.

/lib/systemd/system-shutdown/mdadm.shutdown is in mdadm 3.3.2-5+deb8u2.

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/sh
# We need to ensure all md arrays with external metadata
# (e.g. IMSM, DDF) are clean before completing the shutdown.
/sbin/mdadm --wait-clean --scan