This file is indexed.

/usr/share/ltsp/plugins/ltsp-build-client/Ubuntu/040-update-sshkeys is in ltsp-server 5.4.2-6+deb7u1.

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

The actual contents of the file can be viewed below.

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case "$MODE" in
    finalization)
        /usr/sbin/ltsp-update-sshkeys
        ;;
esac