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: [[search-field-caps-api-path-params]]
  ==== {api-path-parms-title}
  
  `<target>`::
  (Optional, string)
  Comma-separated list of data streams, indices, and index aliases used to limit
  the request. Wildcard expressions (`*`) are supported.
  +
  To target all data streams and indices in a cluster, omit this parameter or use
  `_all` or `*`.
  
  
  [[search-field-caps-api-query-params]]
  