anchor.diff:  <3> The field `rating` is not searchable in `index4`.
   <4> The field `title` is defined as `text` in all indices.
   
  -[float]
  -==== Unmapped fields
   
   By default unmapped fields are ignored. You can include them in the response by
   adding a parameter called `include_unmapped` in the request:
  
positive.code: GET _field_caps?fields=rating,title&include_unmapped
  --------------------------------------------------
  
  In which case the response will contain an entry for each field that is present in
  some indices but not all:
  
  [source,js]
  --------------------------------------------------
  {
      "indices": ["index1", "index2", "index3"],
  
negative.code: [[search-field-caps]]
  === Field Capabilities API
  
  Allows you to retrieve the capabilities of fields among multiple indices.
  
  [source,console]
  --------------------------------------------------
  GET /_field_caps?fields=rating
  --------------------------------------------------
  
  
  [[search-field-caps-api-request]]
  ==== {api-request-title}
  
  `GET /_field_caps` 
  
  `POST /_field_caps` 
  
  `GET /<index>/_field_caps` 
  
  `POST /<index>/_field_caps`
  
  
  [[search-field-caps-api-desc]]
  ==== {api-description-title}
  
  
  The field capabilities API returns the information about the capabilities of 
  fields among multiple indices.
  
  
  [[search-field-caps-api-path-params]]
  ==== {api-path-parms-title}
  
  include::{docdir}/rest-api/common-parms.asciidoc[tag=index]
  
  
  [[search-field-caps-api-query-params]]
  ==== {api-query-parms-title}
  
  include::{docdir}/rest-api/common-parms.asciidoc[tag=allow-no-indices]
  
  include::{docdir}/rest-api/common-parms.asciidoc[tag=expand-wildcards]
  +
  --
  Defaults to `open`.
  --
  
  include::{docdir}/rest-api/common-parms.asciidoc[tag=fields]
  
  include::{docdir}/rest-api/common-parms.asciidoc[tag=index-ignore-unavailable]
  
  `include_unmapped`::
    (Optional, boolean) If `true`, unmapped fields are included in the response. 
    Defaults to `false`.
  
  
  [[search-field-caps-api-response-body]]
  ==== {api-response-body-title}
    
  
  
  `searchable`::
    Whether this field is indexed for search on all indices.
  
  `aggregatable`::
    Whether this field can be aggregated on all indices.
  
  `indices`::
    The list of indices where this field has the same type, or null if all indices 
    have the same type for the field.
  
  `non_searchable_indices`::
    The list of indices where this field is not searchable, or null if all indices 
    have the same definition for the field.
  
  `non_aggregatable_indices`::
    The list of indices where this field is not aggregatable, or null if all 
    indices have the same definition for the field.
  
  
  [[search-field-caps-api-example]]
  ==== {api-examples-title}
  
  
  The request can be restricted to specific indices:
  
  [source,console]
  --------------------------------------------------
  