This file is indexed.

/etc/ca-certificates/update.d/mono-keystore is in ca-certificates-mono 4.2.1.102+dfsg2-7ubuntu4.

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

set -e

echo "Updating Mono key store"

# always return true, even if the tool blows up for some reason.
# we don't want to mess with users at install-time. failure here
# isn't really fatal anyway, just inconvenient
/usr/bin/cert-sync /etc/ssl/certs/ca-certificates.crt || true

echo "Done"