Just Pushed: Indices Stats API + indexing level statistics

Heya,

Just pushed a new API, indices stats, and, also, we have new indexing
level statistics (index/delete operation stats). Here is the issue:
https://github.com/elasticsearch/elasticsearch/issues/1273.

The indices status API also provides statistics, but, its recommended to
use the new API for stats when 0.18 will be out.

-shay.banon