Kibana export CSV from discovery - err:Unsupported content-type of false specified by job output

Elastic/Kibana version 7.13.3
I am trying to export data from Elasticsearch using
discover->save as->share->csv reports -> generate CSV

But I receive messge report generated and when I try to download it it provides this err message

{"statusCode":400,"error":"Bad Request","message":"Unsupported content-type of false specified by job output"}

This is from index gerenated by transform API and there is no timestamp field.

Do you have any idea how to troubleshoot this err?
thank you

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