In your code, each keyword can only point to one topic, which isn't very helpful.
if you stored a list of topics per keyword it would be much more flexible. As emacs can do everything there are going to be a lot of topics with the emacs keyword ;)
for my $next_keyword ( @{ $next_topic->{keywords} } ) {
# Store keyword in index.
push @{$keyword{$next_keyword}} , $i;
}
...
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