This file is indexed.

/etc/X11/Xsession.d/75dbus_dbus-launch is in dbus-x11 1.10.6-1ubuntu3.1.

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 [ -z "$DBUS_SESSION_BUS_ADDRESS" ] && [ -x "$DBUSLAUNCH" ]; then
    STARTDBUS=yes
  fi
fi

if [ -n "$STARTDBUS" ]; then
  STARTUP="$DBUSLAUNCH --exit-with-session $STARTUP"
fi