code: public MessageResponse withEndpointResult(java.util.Map<String, EndpointMessageResult> endpointResult) {
          setEndpointResult(endpointResult);
          return this;
      }
docs: A map containing a multi part response for each address, with the endpointId as the key and the result as the
  value.
  
  @param endpointResult
  A map containing a multi part response for each address, with the endpointId as the key and the result as
  the value.
  @return Returns a reference to this object so that method calls can be chained together.