title: How to store relational data in elasticsearch
body: <p>What are the options to store relational data in elasticsearch. I know the following approaches</p>
  
  <ol>
  <li><p><strong>Nested object</strong> :- I don't want to store data in nested format because I want to update the one document without changing the other document and if I use nested object then there will be repetition of child data in parent documents.</p></li>
  <li><p><strong>Parent-child</strong> :- I don't want to store data in single index, but for using Parent-child data needs to be present in one index(different types). I know this restriction will be removed in future release as mentioned in <a href="https://github.com/elastic/elasticsearch/issues/15613" rel="noreferrer">https://github.com/elastic/elasticsearch/issues/15613</a> issue, but I want a solution that should work with 5.5 version.</p></li>
  </ol>
  
  <p>Is there any other approach other then above.</p>