This file is indexed.

/etc/xl2tpd/l2tp-secrets is in xl2tpd 1.3.6+dfsg-1.

This file is owned by root:root, with mode 0o600.

The actual contents of the file can be viewed below.

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# Secrets for authenticating l2tp tunnels
# us	them	secret
# *		marko blah2
# zeus		marko	blah
# *	*	interop