Are stored fields compressed by default?

[Gili Nachum]

Hi! I'm planning to use atomic-updates
<https://wiki.apache.org/solr/Atomic_Updates> which means having all fields
stored.
Some docs might have text fields of up to 200K, I will feel better knowing
that Solr automatically compresses stored fields (I know Lucene 4.x default
codec does).
*Are stored fields compressed by default? Or there's a way to configure it?
(Solr 4.7).*
Thanks!