Hi Mark,
Admittedly, I'm not very familiar with es-hadoop. It was my understanding from reading through some of the docs and the setup, etc. that it was elasticsearch that can use hadoop as it's back-end storage (rather than Lucene for example). If that's not the case then obviously it wouldn't help much.
Once I get the client code changed to work with 5.0 (mainly dependencies) I'll see if I can put together a simple test and I'll try to submit everything pertinent at that point.
Thanks