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• Current client users should not be affected, this is new api methods being added to client apis
• Message version allows clients expecting older message version, would not be impacted 
  • older producers simply would produce a message which doesn't support headers
    • upcasting would result in a message without headers
    • new consumer would simply get a message with empty headersand as no headers on send would have none.
  • older consumers simply would consume a message oblivious to there being any headersthey would not be aware of any headers
    • down casting would remove headers from the message as older message format doesn't have these in protocol.
• Message version migration would be handled as like in KIP-32

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