This file is indexed.

/usr/lib/R/site-library/nnls/INDEX is in r-cran-nnls 1.4-1build1.

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

The actual contents of the file can be viewed below.

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nnls                    The Lawson-Hanson NNLS implemention of
                        non-negative least squares
nnls-package            The Lawson-Hanson NNLS implementation of
                        non-negative least squares
nnnpls                  An implementation of least squares with
                        non-negative and non-positive constraints