title: Determine the count of data nodes and indices in elasticsearch
body: <p>Imagine that I have so many around millions of nginx, apache,..types of logs.
  I want to send them to elasticsearch day to day. I want to ask that. How should I chose the count of nodes and documents. I mean should i create an index for every day or create an index for just the type of log and create documents for days ? and What about count of data nodes. Can someone help thanks a lot</p>