[Feedback]: https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-security-saml-prepare-authentication Doesn't show correct response

[philippkahr]

https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-security-saml-prepare-authentication

The response is not:

{
  "acknowledged": true
}

the true response is:

{
  "metadata": """<?xml version="1.0" encoding="UTF-8"?><md:EntityDescriptor xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" entityID="https://....kb.us-central1.gcp.cloud.es.io"><md:SPSSODescriptor AuthnRequestsSigned="false" WantAssertionsSigned="true" protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol"><md:SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="https://....kb.us-central1.gcp.cloud.es.io/logout"/><md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://....kb.us-central1.gcp.cloud.es.io/api/security/saml/callback" index="1" isDefault="true"/></md:SPSSODescriptor></md:EntityDescriptor>"""
}