This file is indexed.

/usr/lib/R/site-library/downloader/INDEX is in r-cran-downloader 0.3-1.

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

The actual contents of the file can be viewed below.

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download                Download a file, using http, https, or ftp
downloader              downloader: a package for making it easier to
                        download files over https
sha_url                 Download a file from a URL and find a SHA-1
                        hash of it
source_url              Download an R file from a URL and source it