Hi vrmandadi,
Try like this,
| eval average_response_time = strptime(EML_REQUEST_TIME, "%Y-%m-%d %H:%M:%S.%3N") - strptime(EML_RESPONSE_TIME, "%Y-%m-%d%H:%M:%S.%3N")
Hope it helps.
Edit: This might work, as you did not mention those brackets on your sample data.
| rename "ENDPOINT_LOG.EML_REQUEST_TIME" as EML_REQUEST_TIME | rename "ENDPOINT_LOG.EML_RESPONSE_TIME" as EML_RESPONSE_TIME | eval average_response_time = strptime(EML_REQUEST_TIME, "%Y-%m-%d %H:%M:%S.%3N") - strptime(EML_RESPONSE_TIME, "%Y-%m-%d%H:%M:%S.%3N")
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