This file is indexed.

/usr/lib/R/site-library/effects/INDEX is in r-cran-effects 4.0.0-1.

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

The actual contents of the file can be viewed below.

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LegacyArguments         Legacy Arguments for 'plot' and 'Effect'
                        Methods
effect                  Functions For Constructing Effect Displays
effects-package         Effect Displays for Linear, Generalized Linear,
                        and Other Models
effectsTheme            Set the lattice Theme for Effect Plots
plot.predictoreff       Draw Predictor Effect Plots
predictorEffects        Functions For Computing Predictor Effects
summary.eff             Summarizing, Printing, and Plotting Effects