title: How to get list of all field names in ElasticSearch?
body: <p>I've been trying to get all the field names in my ElasticSearch database dynamically so I can input them into a GUI drop down search box.</p>
  
  <p><code>{<br>
       "odd": ["three", "five", "nine"],<br>
       "even": ["two", "four", "six"],<br>
       "prime": ["seven", "thirteen", "seventeen"]<br>
  }</code></p>
  
  <p>Is there a way to obtain the field names : odd, even and prime<br>
  Such that I can enter them into a Jcombobox in the user interface?</p>