This file is indexed.

/usr/lib/update-cluster/mpich.updatelist is in mpich-bin 1.2.7-10ubuntu1.

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
set -e 

cat $CLUSTERXML | \
update-cluster-remove --master | \
update-cluster-parseconfig hostname > /etc/mpich/machines.LINUX || \
exit 1