Faceting within groups

[Cool Techi]

Hi,
I am not sure if faceting with groups is supported, the documents do seem to 
suggest it works, but cant seem to get the intended results.
<str name="q">("Amazon Cloud" OR ("IBM Cloud")</str><str 
name="group.field">sourceId</str><str name="facet.field">sentiment</str><str 
name="group">true</str><str name="group.facet">true</str>
Also, if it work's does solr cloud support it.
Regards,Ayush