anchor.diff:  [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`.
  +It is recommended to make index templates typeless by re-adding them with
  +`include_type_name` set to `false`. Under the hood, typeless templates will use
  +the dummy type `_doc` when creating indices.
   
   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
  
positive.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 will result
    in a deprecation warning.
  
  * The `_default_` mapping type is removed.
  
  
negative.code: 
  * 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 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::
  
  