search: do not index references and inreplyto terms

We no longer need them, as we can rely on index-time thread
resolution and thread merging.  This allows us to index less
data and hopefully increase efficiency.

1 files changed, 0 insertions, 5 deletions

diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 2ac53a73..dec33334 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -238,20 +238,15 @@ sub link_message_to_parents {
                 }
         }
         if (@refs) {
-                $doc->add_term(xpfx('inreplyto') . $irt) if defined $irt;
                 $smsg->{references_sorted} = '<'.join('><', @refs).'>';
 
-                my $ref_pfx = xpfx('references');
-
                 # first ref *should* be the thread root,
                 # but we can never trust clients to do the right thing
                 my $ref = shift @refs;
-                $doc->add_term($ref_pfx . $ref);
                 $tid = $self->_resolve_mid_to_tid($ref);
 
                 # the rest of the refs should point to this tid:
                 foreach $ref (@refs) {
-                        $doc->add_term($ref_pfx . $ref);
                         my $ptid = $self->_resolve_mid_to_tid($ref);
                         if ($tid ne $ptid) {
                                 $self->merge_threads($tid, $ptid);