/usr/lib/R/site-library/DelayedArray/INDEX is in r-bioc-delayedarray 0.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 | DelayedArray-class      DelayedArray objects
DelayedArray-utils      Common operations on DelayedArray objects
RleArray-class          RleArray objects
bind-arrays             Bind arrays along their rows or columns
block_processing        Block processing of an array
realize                 Realize a DelayedArray object
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