Do not update the C<all> external index by default. This negates
all uses of C<-E> / C<--update-extindex=> on the command-line.
+=item --since=DATESTRING
+
+=item --after=DATESTRING
+
+=item --until=DATESTRING
+
+=item --before=DATESTRING
+
+Passed directly to L<git-log(1)> to limit changes for C<--reindex>
+
=back
=head1 FILES