This file is indexed.

/etc/emacs23/site-start.d/50auctex.el is in auctex 11.86-2ubuntu1.

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

The actual contents of the file can be viewed below.

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;;; This is a conffile: you can edit it if you like; however,
;;; please note that if you do not want AUCTeX to override the standard
;;; Emacs TeX mode, you may unload AUCTeX completely by evaluating the
;;; form "(unload-feature 'tex-site)" (i.e., put that string into your
;;; "~/.emacs" to disable AUCTeX completely).

(let ((list '((lisp . "auctex") (source . "auctex"))))
  (while list
    (let ((elt (car list)))
      (cond
       ((equal 'lisp (car elt))
	(let ((dir (concat "/usr/share/"
			   (symbol-name debian-emacs-flavor)
			   "/site-lisp/" (cdr elt))))
	  (when (file-directory-p dir)
	    (if (fboundp 'debian-pkg-add-load-path-item)
		(debian-pkg-add-load-path-item dir)
	      (add-to-list 'load-path dir 'append)))))
       ((equal 'source (car elt))
	(let ((dir (concat "/usr/share/emacs/site-lisp/" (cdr elt))))
	  (when (file-directory-p dir)
	    (add-to-list 'load-path dir 'append))))))
    (setq list (cdr list))))

(load "auctex.el")
(load "preview-latex.el")