anchor.diff:  === Field Capabilities API
   
   Allows you to retrieve the capabilities of fields among multiple indices.
  +For data streams, the API returns field capabilities among the stream's backing
  +indices.
   
   [source,console]
   --------------------------------------------------
  
positive.code: 
  `POST /_field_caps`
  
  `GET /<index>/_field_caps`
  
  `POST /<index>/_field_caps`
  
  
  [[search-field-caps-api-desc]]
  
negative.code: ==== {api-examples-title}
  
  
  The request can be restricted to specific data streams and indices:
  
  [source,console]
  --------------------------------------------------
  