This file is indexed.

/usr/lib/R/library/codetools/INDEX is in r-cran-codetools 0.2-15-1.

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

The actual contents of the file can be viewed below.

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checkUsage              Check R Code for Possible Problems
codetools               Low Level Code Analysis Tools for R
findGlobals             Find Global Functions and Variables Used by a
                        Closure
showTree                Print Lisp-Style Representation of R Expression