Allow customization of node name used in StatsD metric key for node level stats
Spin up 2 nodes during tests
Index more docs during tests to get more data
Fix test assertions
Add some error checking and fix names
Use  for key prefix var  is confusing
Simplify error logging
Simplify stat key for cluster index totals
Sum and report index stats on a per index and per shard basis; make it configureable
Document StatsD key format