This file is indexed.

/etc/strongswan.d/charon/lookip.conf is in libcharon-extra-plugins 5.5.1-4+deb9u4.

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

The actual contents of the file can be viewed below.

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lookip {

    # Whether to load the plugin. Can also be an integer to increase the
    # priority of this plugin.
    load = yes

    # Socket provided by the lookip plugin.
    # socket = unix://${piddir}/charon.lkp

}