This file is indexed.

/usr/share/vim/addons/ftdetect/survex.vim is in survex 1.2.30-1.

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

The actual contents of the file can be viewed below.

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au BufRead,BufNewFile *.svx	setf survex
au BufRead,BufNewFile *.err	setf survex-err