This file is indexed.

/usr/bin/gnome-session is in gnome-session-bin 3.28.1-0ubuntu2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

if [ "x$XDG_SESSION_TYPE" = "xwayland" ] &&
   [ "x$XDG_SESSION_CLASS" != "xgreeter" ] &&
   [  -n "$SHELL" ] &&
   grep -q "$SHELL" /etc/shells &&
   ! (echo "$SHELL" | grep -q "false") &&
   ! (echo "$SHELL" | grep -q "nologin"); then
  if [ "$1" != '-l' ]; then
    exec bash -c "exec -l '$SHELL' -c '$0 -l $*'"
  else
    shift
  fi
fi

#SETTING=$(gsettings get org.gnome.system.locale region)
#REGION=${SETTING#\'}
#REGION=${REGION%\'}

if [ -n "$REGION" ]; then
  export LC_TIME=$REGION
  export LC_NUMERIC=$REGION
  export LC_MONETARY=$REGION
  export LC_MEASUREMENT=$REGION
  export LC_PAPER=$REGION
fi

exec /usr/lib/gnome-session/gnome-session-binary "$@"