Random Streaming Function not there? SolrCloud 6.3.0

[Joe Obernberger]

I'm getting an error:

{"result-set":{"docs":[
{"EXCEPTION":"Invalid stream expression 
random(MAIN,q=\"FULL_DOCUMENT:obamacare\",rows=100,fl=DocumentId) - 
function 'random' is unknown (not mapped to a valid 
TupleStream)","EOF":true}]}}

When trying to use the streaming random function.  I'm using curl with:
curl --data-urlencode 
'expr=random(MAIN,q="FULL_DOCUMENT:obamacare",rows="100",fl="DocumentId")' 
http://cordelia:9100/solr/MAIN/stream

Any ideas?  Thank you!

-Joe