title: What is the ideal bulk size formula in ElasticSearch?
body: <p>I believe there should be a formula to calculate bulk indexing size in ElasticSearch. Probably followings are the variables of such a formula.</p>
  
  <ul>
  <li>Number of nodes</li>
  <li>Number of shards/index</li>
  <li>Document size</li>
  <li>RAM</li>
  <li>Disk write speed</li>
  <li>LAN speed</li>
  </ul>
  
  <p>I wonder If anyone know or use a mathematical formula. If not, how people decide their bulk size? By trial and error?</p>