This file is indexed.

/usr/lib/R/site-library/Rglpk/INDEX is in r-cran-rglpk 0.5-2-1build1.

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

The actual contents of the file can be viewed below.

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Rglpk_read_file         Interface to GLPK's file reader
Rglpk_solve_LP          Linear and Mixed Integer Programming Solver
                        Using GLPK