This file is indexed.

/usr/share/doc/sanitizer/CREDITS is in sanitizer 1.76-5.

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

The actual contents of the file can be viewed below.

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I figured the CREDITS format used by the Linux kernel was as good as 
any.  I doubt this file will ever be quite as long though. :-)

Linus said:

  The file is sorted by name and formatted to allow easy grepping and
  beautification by scripts.  The fields are: name (N), email (E),
  web-address (W), PGP key ID and fingerprint (P), description (D), and
  snail-mail address (S).

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N: Bjarni R. Einarsson 
E: bre@netverjar.is
W: http://bre.klaki.net/
D: Wrote initial versions of everything