Scripted field to calculate

Hello community!!

please how can i write a Scripted fields that calculed in follow operation. thanks for your advice

Lifetime = ProcStartTimeRelativeMs + ";" + ProcLifetimeMs + ";" + TotalBootDurationMs + ";" + ProcName + ";" + SessionID

You'll want to use a Painless script something like this:

doc['ProcStartTimeRelativeMs'].value + ";" + doc['ProcLifetimeMs'].value + ";" + doc['TotalBootDurationMs'].value + ";" + doc['ProcName'].value + ";" + doc['SessionID'].value

thank you for answer.
i wrote it like this

But i get this error , when i use the field name in kibana. please do you have any idea about the error.
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