title: Auto-Increment Id in Elasticsearch
body: <p>In Sql we have auto increment which increase the value by 1 when we add any new row. I would like to have same functionality in elastic search.</p>
  <p>Whenever I insert any document, there should be a corresponding field in index which holds the incremented data and it should be updated automatically.</p>
  <p>Is it possible in elastic search ?</p>