[Dovecot] FTS Plugin design

Hi all,

Currently I am developing some changes on the solr plugin. I want this plugin indexing also the attachment's content. I have already started to look on plugin's source but I am having some problems understanding how it works.

I didn't understood yet what is the plugin's design and how the plugins are called from the core system and I was wondering if anyone could help me with that.

Sorry if this doubts sound stupid but I am newcomer on Dovecot.

Regards, Rui Carneiro