This file is indexed.

/usr/lib/R/site-library/gridExtra/INDEX is in r-cran-gridextra 2.0.0-1.

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

The actual contents of the file can be viewed below.

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arrangeGrob             Arrange multiple grobs on a page
gridExtra-package       Miscellaneous Functions for "Grid" Graphics
ngonGrob                Regular polygon grob
tableGrob               Graphical display of a textual table