Adding plugins to dovecot.conf - FTS Solr

==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 14.04
- Related log if you're reporting an issue:
====

Hi Zhang,

I need to add FTS to my plugin. From what I understand is that the /etc/dovecot/conf.d/10-mail.conf is not used by iredmail.
In this case I would need to add it to the dovecot.conf. Correct?

plugin {
  fts = solr
  fts_solr = url=http://127.0.0.1:8983/solr/ break-imap-search
}

Also please advise how do I include it.
Do I just paste it in the mail_plugins field?, Appreciate if you could provide me an example of how to do it.

Below is part of my current dovecot.conf :-

mail_plugins = quota fts

Thanks
Kevin