Re: CEP-15 Update

[Caleb Rackliffe]

   1. Just a quick reminder that CASSANDRA-18196
   <https://issues.apache.org/jira/browse/CASSANDRA-18196> is where we had
   been tracking this previously with respect to things like the feature flag (
   CASSANDRA-18195 <https://issues.apache.org/jira/browse/CASSANDRA-18195>),
   etc. I'm not sure if we want to officially tie up/resolve the subtasks
   there for Jira hygiene...