title: Unknown key for a START_ARRAY in [fields]. in elasticsearch
body: <p>I have been trying to get the specific fields data from the index that is been provided but getting the error "Unknown key for a START_ARRAY in [fields]".</p>
  
  <p>Unknown key for a START_ARRAY in [fields].</p>
  
  <p>fields: ['snippet.publishedAt']</p>
  
  <p>my expected output out is it should provide the fields array in the hits</p>