This file is indexed.

/usr/lib/R/site-library/R6/INDEX is in r-cran-r6 2.2.0-2.

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

The actual contents of the file can be viewed below.

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R6Class                 Create an R6 reference object generator
as.list.R6              Create a list from an R6 object
is.R6                   Is an object an R6 Class Generator or Object?