This file is indexed.

/usr/share/emacs24/site-lisp/subdirs.el is in emacs24-common 24.5+1-6ubuntu1.

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

The actual contents of the file can be viewed below.

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(if (fboundp 'normal-top-level-add-subdirs-to-load-path)
    (normal-top-level-add-subdirs-to-load-path))