extsearch: unconditionally reopen on access

Since ExtSearch lacks the janky cleanup timer of
PublicInbox::Inbox objects, its search results get stale.

Reopen the Xapian DB on every ->search call for now, as
reducing reopen calls doesn't seem worth the complexity.

The Xapian::Database::reopen operation itself takes only ~50us
on my old workstation with 3 shards totaling <200GB.  Other
parts of Xapian dominates the search time, so the reopen seems
inconsequential with single-digit shard counts.

1 files changed, 1 insertions, 3 deletions

diff --git a/lib/PublicInbox/ExtSearch.pm b/lib/PublicInbox/ExtSearch.pm
index a2b97798..7c9586a6 100644
--- a/lib/PublicInbox/ExtSearch.pm
+++ b/lib/PublicInbox/ExtSearch.pm
@@ -29,8 +29,6 @@ sub misc {
         $self->{misc} //= PublicInbox::MiscSearch->new("$self->{xpfx}/misc");
 }
 
-sub search { $_[0] } # self
-
 # overrides PublicInbox::Search::_xdb
 sub _xdb {
         my ($self) = @_;
@@ -126,6 +124,6 @@ no warnings 'once';
 *recent = \&PublicInbox::Inbox::recent;
 
 *max_git_epoch = *nntp_usable = *msg_by_path = \&mm; # undef
-*isrch = *search;
+*isrch = *search = \&PublicInbox::Search::reopen;
 
 1;