title: How can I batch Kafka reads to Elasticsearch
body: <p>I'm not too familiar with Kafka but I would like to know what's the best way to
  read data in batches from Kafka so I can use Elasticsearch Bulk Api to load the data faster and reliably.</p>
  
  <p>Btw, am using Vertx for my Kafka consumer</p>
  
  <p>Thank you,</p>