Dovecot and Solr 6

[KSB]

Hi!
Dovecot 2.2.24
Had set up solr and new schema collection. Copied dovecot provided 
schema. There was an error with booleans (while getting schema via 
http), which I "solved" by removing "add-unknown-fields-to-the-schema" 
from solrconfig.xml. It is correct way to solve this?
Anyway, I run tcpdump to see network activity between dovecot and solr:
#tcpdump -i lo port 8983
and see nothing while doing:
#doveadm fts rescan -u username at domain.tld
no output also from doveadm.

Noticed that dovecot.index.log reapears in user mail root if deleted.

plugin {
   fts = solr
   fts_solr = url=http://localhost:8983/solr/dovecot/ debug
   ..
}

--
KSB