/usr/lib/R/site-library/AnnotationDbi/INDEX is in r-bioc-annotationdbi 1.26.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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                        and 'keytypes'.
ACYRTHOSIPHON_PISUM     Descriptions of available values for 'columns'
                        and 'keytypes' for inparanpoid packages.
AnnDbObj-objects        AnnDbObj objects
AnnDbPkg-checker        Check the SQL data contained in an SQLite-based
                        annotation package
AnnotationDb            AnnotationDb objects and their progeny, methods
                        etc.
AnnotationDbi-defunct   Defunct Functions in Package 'AnnotationDbi'
AnnotationDbi-deprecated
                        Deprecated Functions in package 'AnnotationDbi'
Bimap                   Bimap objects and the Bimap interface
Bimap-direction         Methods for getting/setting the direction of a
                        Bimap object, and undirected methods for
                        getting/counting/setting its keys
Bimap-envirAPI          Environment-like API for Bimap objects
Bimap-keys              Methods for manipulating the keys of a Bimap
                        object
Bimap-toTable           Methods for manipulating a Bimap object in a
                        data-frame style
BimapFormatting         Formatting a Bimap as a list or character
                        vector
GOFrame                 GOFrame and GOAllFrame objects
GOID                    Descriptions of available values for 'columns'
                        and 'keytypes' for GO.db.
GOTerms-class           Class "GOTerms"
KEGGFrame               KEGGFrame objects
inpIDMapper             Convenience functions for mapping IDs through
                        an appropriate set of annotation packages
makeGOGraph             A convenience function to generate graphs based
                        on the GO.db package
make_eg_to_go_map       Create GO to Entrez Gene maps for chip-based
                        packages
print.probetable        Print method for probetable objects
toSQLStringSet          Convert a vector to a quoted string for use as
                        a SQL value list
toggleProbes            Methods for getting/setting the filters on a
                        Bimap object
unlist2                 A replacement for unlist() that does not mangle
                        the names
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