This file is indexed.

/etc/X11/Xsession.d/55xfce4-session is in xfce4-session 4.12.1-3ubuntu3.

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

The actual contents of the file can be viewed below.

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# For Xfce, we add a directory to XDG_DATA_DIRS
# to allow the admin to set, for example, defaults.list properly
BASESTARTUP=$(basename "$STARTUP" | cut -d\  -f1)
if [ "$BASESTARTUP" = x-session-manager ]; then
    BASESTARTUP=$(basename $(readlink /etc/alternatives/x-session-manager))
fi
case "$BASESTARTUP" in
  xfce4-session|startxfce4)
    # We prepend /usr/share/xfce4 since its defaults.list actually points 
    # to /etc so it is configurable.
    if [ -z "$XDG_DATA_DIRS" ]; then
      XDG_DATA_DIRS=/usr/share/xfce4:/usr/local/share/:/usr/share/
    else
      XDG_DATA_DIRS=/usr/share/xfce4:"$XDG_DATA_DIRS"
    fi
    export XDG_DATA_DIRS
    ;;
esac