title: What is an index in Elasticsearch
body: <p>What is an index in Elasticsearch? Does one application have multiple indexes or just one?</p>
  <p>Let's say you built a system for some car manufacturer. It deals with people, cars, spare parts, etc. Do you have one index named manufacturer, or do you have one index for people, one for cars and a third for spare parts? Could someone explain?</p>