[Dovecot] Use dovecot-fts core

data/conf/dovecot/dovecot.conf

@@ -308,7 +308,7 @@ plugin {
   acl = vfile
   fts = solr
   fts_autoindex = yes
-  fts_solr = url=http://solr:8983/solr/dovecot/
+  fts_solr = url=http://solr:8983/solr/dovecot-fts/
   quota = dict:Userquota::proxy::sqlquota
   quota_rule2 = Trash:storage=+100%%
   sieve = /var/vmail/sieve/%u.sieve