This file is indexed.

/etc/ipsec.secrets is in strongswan-starter 4.5.2-1.2.

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

The actual contents of the file can be viewed below.

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# This file holds shared secrets or RSA private keys for inter-Pluto
# authentication.  See ipsec_pluto(8) manpage, and HTML documentation.

# RSA private key for this host, authenticating it to any other host
# which knows the public part.  Suitable public keys, for ipsec.conf, DNS,
# or configuration of other implementations, can be extracted conveniently
# with "ipsec showhostkey".

# this file is managed with debconf and will contain the automatically created private key
include /var/lib/strongswan/ipsec.secrets.inc