/usr/lib/R/site-library/DEoptimR/INDEX is in r-cran-deoptimr 1.0-8-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | JDEoptim Nonlinear Constrained and Unconstrained
Optimization via Differential Evolution
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