This file is indexed.

/usr/lib/R/site-library/lpSolve/INDEX is in r-cran-lpsolve 5.6.13-1.

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

The actual contents of the file can be viewed below.

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lp                      Linear and Integer Programming
lp.assign               Integer Programming for the Assignment Problem
lp.object               LP (linear programming) object
lp.transport            Integer Programming for the Transportation
                        Problem
make.q8                 Generate sparse constraint matrix for 8-queens
                        problem
print.lp                Print an lp object