anchor.diff:  
   * In 6.7, the index creation, index template, and mapping APIs support a query
     string parameter (`include_type_name`) which indicates whether requests and
  -  responses should include a type name. It defaults to `true`, and not setting
  -  `include_type_name=false` will result in a deprecation warning. Indices which
  -  don't have an explicit type will use the dummy type name `_doc`.
  +  responses should include a type name. It defaults to `true`, and should be set
  +  to an explicit value to prepare to upgrade to 7.0. Not setting `include_type_name`
  +  will result in a deprecation warning. Indices which don't have an explicit type will
  +  use the dummy type name `_doc`.
   
   Elasticsearch 7.x::
   
  
positive.code: [float]
  ==== Index templates
  
  It is recommended to make index templates typeless before upgrading to 7.0 by
  re-adding them with `include_type_name` set to `false`.
  
  In case typeless templates are used with typed index creation calls or typed
  templates are used with typeless index creation calls, the template will still
  
negative.code:   for auto-generated ids.
  
  * The `include_type_name` parameter in the index creation, index template,
    and mapping APIs will default to `false`. Setting the parameter at all will
    result in a deprecation warning.
  
  * The `_default_` mapping type is removed.
  
  