+ my $data;
+ $data->{$_} = join(' ', @{ $ds->{$_}->{search} }) foreach
+ map { m/^\d+$/ ? $_ = $_ . '_num' : $_ }
+ # add _num suffix for riak search https://wiki.basho.com/display/RIAK/Riak+Search+-+Schema
+ grep { exists $ds->{$_}->{search} }
+ keys %$ds;