Esrally creat index error,class_cast_exception

[ERROR] Cannot race. Error in load generator [0]
Cannot run task [create-index]: Request returned an error. Error type: transport, Description: class_cast_exception ({'error': {'root_cause': [{'type': 'class_cast_exception', 'reason': 'java.lang.String cannot be cast to java.util.Map'}], 'type': 'class_cast_exception', 'reason': 'java.lang.String cannot be cast to java.util.Map'}, 'status': 500})

somebody help me

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