This file is indexed.

/usr/lib/R/site-library/future/INDEX is in r-cran-future 1.7.0-1ubuntu1.

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

The actual contents of the file can be viewed below.

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%globals%               Specify globals and packages for a future
                        assignment
%label%                 Specify label for a future assignment
%lazy%                  Control lazy / eager evaluation for a future
                        assignment
%plan%                  Use a specific plan for a future assignment
%seed%                  Set random seed for future assignment
%tweak%                 Temporarily tweaks the arguments of the current
                        strategy
Future-class            A future represents a value that will be
                        available at some point in the future
FutureGlobals           A representation of a set of globals used with
                        futures
as.cluster              Coerce an object to a cluster object
backtrace               Back trace the expressions evaluated before a
                        condition was caught
cluster                 Create a cluster future whose value will be
                        resolved asynchronously in a parallel process
find_references         Get first or all references of an R object
fold                    Efficient fold / reduce / accumulate / combine
                        of a vector
future                  Create a future
futureOf                Get the future of a future variable
futures                 Gets all futures in an object
makeClusterPSOCK        Create a cluster of R workers for parallel
                        processing
multicore               Create a multicore future whose value will be
                        resolved asynchronously in a forked parallel
                        process
multiprocess            Create a multiprocess future whose value will
                        be resolved asynchronously using multicore or a
                        multisession evaluation
multisession            Create a multisession future whose value will
                        be resolved asynchronously in a parallel R
                        session
nbrOfWorkers            Gets the number of workers available
nullcon                 Creates a connection to the system null device
plan                    Plan how to resolve a future
remote                  Create a remote future whose value will be
                        resolved asynchronously in a remote process
resolve                 Resolve one or more futures synchronously
resolved                Check whether a future is resolved or not
sequential              Create a sequential future whose value will be
                        in the current R session
supportsMulticore       Check whether multicore processing is supported
                        or not
tweak                   Tweaks a future function by adjusting its
                        default arguments
value.Future            The value of a future
values                  Gets all values in an object