HTTP/1.1 400 Bad Request
x-amzn-requestid: 8d3eb39e-3238-11e2-b458-9949c02a6feb
content-type: text/xml
content-length: 516
date: Mon, 19 Nov 2012 11:02:04 GMT

<ErrorResponse xmlns="http://cloudsearch.amazonaws.com/doc/2011-02-01">
  <Error>
    <Type>Sender</Type>
    <Code>ValidationError</Code>
    <Message>2 validation errors detected: Value '' at 'indexFieldName' failed to satisfy constraint: Member must satisfy regular expression pattern: [a-z][a-z0-9_]*; Value '' at 'indexFieldName' failed to satisfy constraint: Member must have length greater than or equal to 1</Message>
  </Error>
  <RequestId>8d3eb39e-3238-11e2-b458-9949c02a6feb</RequestId>
</ErrorResponse>
