This file is indexed.

/etc/strongswan.d/charon-logging.conf is in strongswan-charon 5.2.1-6+deb8u6.

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

The actual contents of the file can be viewed below.

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charon {

    # Section to define file loggers, see LOGGER CONFIGURATION in
    # strongswan.conf(5).
    filelog {

        # <filename> is the full path to the log file.
        # <filename> {

            # Loglevel for a specific subsystem.
            # <subsystem> = <default>

            # If this option is enabled log entries are appended to the existing
            # file.
            # append = yes

            # Default loglevel.
            # default = 1

            # Enabling this option disables block buffering and enables line
            # buffering.
            # flush_line = no

            # Prefix each log entry with the connection name and a unique
            # numerical identifier for each IKE_SA.
            # ike_name = no

            # Prefix each log entry with a timestamp. The option accepts a
            # format string as passed to strftime(3).
            # time_format =

        # }

    }

    # Section to define syslog loggers, see LOGGER CONFIGURATION in
    # strongswan.conf(5).
    syslog {

        # Identifier for use with openlog(3).
        # identifier =

        # <facility> is one of the supported syslog facilities, see LOGGER
        # CONFIGURATION in strongswan.conf(5).
        # <facility> {

            # Loglevel for a specific subsystem.
            # <subsystem> = <default>

            # Default loglevel.
            # default = 1

            # Prefix each log entry with the connection name and a unique
            # numerical identifier for each IKE_SA.
            # ike_name = no

        # }

    }

}