hi there is an interesting project called elassandra[1] mixing apache cassandra and elasticsearch. The secondary indexes, and the text column are indexed with es. The interesting part is es is embedded within cassandra and both share the same JVM. The benefit of this, is rich indexes, aggregation and advanced full text features with slight performance impact for writes. Would this kind of hybridization work with phoenix ?
[1] https://www.elassandra.io/ -- nicolas