Adding optional index template for metrics index per time period pattern.
Adding optional index template for metrics index per time period pattern.

DigitalPebble/storm-crawler,jorgelbg/storm-crawler,XciD/storm-crawler,foromer4/storm-crawler,foromer4/storm-crawler,anjackson/storm-crawler,anjackson/storm-crawler,XciD/storm-crawler,DigitalPebble/storm-crawler,jorgelbg/storm-crawler