Remove debug use only code
Check cluster state for elected master
Make node level index stats optional

Add a config to turn on reporting of node level index stats (e.g. docs per
node) which defaults to false.
Update README with new settings
Indices Reporter Should Report Cluster Totals

* Make indices reporter report cluster totals always.
* Let indices reporter sum per index and report if requested.
* Let indices reporter report per shard if requested.