What does this error mean

what does this logstash error mean

"status"=>400, "error"=>{"type"=>"illegal_argument_exception", "reason"=>"Can't merge a non object mapping [batch-upload-usage.costcalculation.elapsed-time] with an object mapping [batch-upload-usage.costcalculation.elapsed-time]"}}}}

this is my logstash filter

mutate {
       split => ["batch-upload-usage.costcalculation_4","="]
       add_field => {"batch-upload-usage.costcalculation.elapsed-time" =>"%{[batch-upload-usage.costcalculation_4][0]}"}
       add_field => {"batch-upload-usage.costcalculation.elapsed-time.value" =>"%{[batch-upload-usage.costcalculation_4][1]}"}
}

How to fix this ?

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