This file is indexed.

/usr/lib/R/library/nnet/INDEX is in r-cran-nnet 7.3-7-1.

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

The actual contents of the file can be viewed below.

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class.ind               Generates Class Indicator Matrix from a Factor
multinom                Fit Multinomial Log-linear Models
nnet                    Fit Neural Networks
nnetHess                Evaluates Hessian for a Neural Network
predict.nnet            Predict New Examples by a Trained Neural Net
which.is.max            Find Maximum Position in Vector