Bug: Elasticsearch - The mapping definition cannot be nested under a type [_doc]

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Example PUT request

Creates this error:

The mapping definition cannot be nested under a type [_doc] unless include_type_name is set to true."}],"type":"illegal_argument_exception","reason":"The mapping definition cannot be nested under a type [_doc] unless include_type_name is set to true.

For the Elasticsearch v7.17.1

Request body update required or workaround by adding a query ?include_type_name=true as used in request.sh

However if a user don't use the request.sh for eg by runing setup.sh but use API clients instead then he would not be able to succeed with the original body of the example PUT request

Currently there is no information how to handle that problem in the README.md

Suggested:

• update the request body for all PUT requests or
• add information in the README.md how to handle that problem (suffix target with ?include_type_name=true)