This file is indexed.

/usr/lib/R/site-library/numDeriv/INDEX is in r-cran-numderiv 2016.8-1-1.1.

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

The actual contents of the file can be viewed below.

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00.numDeriv.Intro       Accurate Numerical Derivatives
genD                    Generate Bates and Watts D Matrix
grad                    Numerical Gradient of a Function
hessian                 Calculate Hessian Matrix
jacobian                Gradient of a Vector Valued Function
numDeriv-package        Accurate Numerical Derivatives