Full text search indexing behavior and testing?

Hi,

I'm confused about FTS. https://wiki.dovecot.org/Tools/Doveadm/Index say's:

"Messages can also be added automatically to full text search index using:

plugin { ... fts_autoindex = yes }"

So I added "fts_autoindex = yes" into dovecot.conf (I'm using single config file). That's it? How to test FTS? Or I still must use some external indexing server?

-- Mart