This file is indexed.

/etc/strongswan.d/charon/coupling.conf is in strongswan-plugin-coupling 5.1.2-0ubuntu2.

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

The actual contents of the file can be viewed below.

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coupling {

    # File to store coupling list to.
    # file =

    # Hashing algorithm to fingerprint coupled certificates.
    # hash = sha1

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

    # Maximum number of coupling entries to create.
    # max = 1

}