For the past 24 hours I've had this error report via email:
Cpanel::Exception::HTTP::Network/(XID eqne46) The system failed to send an <abbr title="Hypertext Transfer Protocol">HTTP</abbr> “GET” request to “http://XLwJEngBOMh6x0ld:__HIDDEN__@127.0.0.1:8984/solr/dovecot/update?commmit=true” because of an error: Could not connect to '127.0.0.1:8984': Connection refused at /usr/local/cpanel/Cpanel/Exception/CORE.pm line 330.
Cpanel::Exception::create("HTTP::Network", HASH(0x1181628)) called at /usr/local/cpanel/Cpanel/Exception.pm line 46
Cpanel::Exception::__ANON__(__CPANEL_HIDDEN__, HASH(0x1181628)) called at /usr/local/cpanel/Cpanel/HTTP/Client.pm line 102
Cpanel::HTTP::Client::request(Cpanel::HTTP::Client=HASH(0x113a228), "GET", "http://XLwJEngBOMh6x0ld:__CPANEL_URLPW_HIDDEN__\@127.0.0.1:8984/solr/"..., HASH(0x16ee930)) called at (eval 5) line 6
HTTP::Tiny::get(Cpanel::HTTP::Client=HASH(0x113a228), "http://XLwJEngBOMh6x0ld:__CPANEL_URLPW_HIDDEN__\@127.0.0.1:8984/solr/"...) called at /usr/local/cpanel/3rdparty/scripts/cpanel_dovecot_solr_commit line 55
I have a ticket open and this is the fix from cPanel devs. Paste the below command (all one line):
/sbin/service cpanel-dovecot-solr stop;su cpanelsolr -c "/usr/local/cpanel/scripts/ckillall -TERM java";sleep 5;su cpanelsolr -c "/usr/local/cpanel/scripts/ckillall -KILL java";/usr/local/cpanel/3rdparty/scripts/setup_cpanel_dovecot_fts;/sbin/service cpanel-dovecot-solr start
Should be no error output and no more annoying emails. Hopfully this saves you having to open a ticket as well.
Another option would be to revert to pre 11.66 setup by uninstalling solr via WHM: