Seems that following part contradicts the EL spec:

The container provides a built-in bean with bean type Conversation , scope @RequestScoped ,
and qualifier @Default , named javax.enterprise.context.conversation .

The EL name "javax.enterprise.context.conversation" is not valid.
Discussion available at http://transcripts.jboss.org/channel/irc.freenode.org/%23cdi-dev/2015/%23cdi-dev.2015-01-06.log.html

and

http://lists.jboss.org/pipermail/cdi-dev/2015-January/thread.html - topic "where is defined javax.enterprise.context.conversation.id?"