This file is indexed.

/etc/X11/Xsession.d/75dbus_dbus-launch is in dbus-x11 1.4.18-1ubuntu1.8.

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

The actual contents of the file can be viewed below.

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# $Id:$
# In order to activate the session bus at X session launch
# simply place use-session-dbus into your /etc/X11/Xsession.options file
#

STARTDBUS=
DBUSLAUNCH=/usr/bin/dbus-launch

if has_option use-session-dbus; then
  if [ -x "$DBUSLAUNCH" ]; then
    STARTDBUS=yes
  fi
fi

if [ -n "$STARTDBUS" ]; then
  # dbus-launch misbehaves when stdin is a console:
  # - http://bugs.debian.org/453755
  # - https://bugs.freedesktop.org/show_bug.cgi?id=39197
  #
  # While we sort out with upstream what the right solution is,
  # work around it by ensuring that stdin is not a console (this is a no-op
  # on xdm and gdm, but not on startx, slim, nodm).
  #
  # It isn't really D-Bus' place to do this - we're changing the environment
  # of everything executed from Xsession.d, not just dbus-launch - but having
  # X apps whose stdin is the console makes very little sense, so arguably
  # startx, slim, nodm etc. should be doing this themselves.
  exec < /dev/null

  STARTUP="$DBUSLAUNCH --exit-with-session $STARTUP"
fi