title: Issue with visualizing a field in Kibana even when elasticsearch has its mapping
body: <p>I have elasticsearch mapping which lists a field but when trying to visualize in kibana it doesnt list that field. Moreover i can see that field under 'popular' section of Discover page.</p>
  
  <p>i see some note like:
  "This field is present in your elasticsearch mapping but not in any documents in the search results. You may still be able to visualize or search on it."</p>
  
  <p>What does this mean and how can i visualize a mapped field.</p>