Need to add an example for bulk API

[manishatGit]

I was recently trying to use the bulk API and had difficulties initially on how to use it. Although the link to https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html explains pretty much about Bulk API in ES but does not emphasize on "How to use it in application" besides a Curl req. I somehow manage to use it when I parse the response body and got the exact failure: "A bulk request must be terminated with a newline".