Select Overwrite field values if you want your field alias to remove the field alias name when the original field does not exist or has no value, or replace the field alias name with the original field name when the field alias name already exists.
REF: https://kinneygroup.com/blog/splunk-fields-of-dreams-how-to-create-calculated-fields-and-aliases/#:~:text=(Optional)%20Select%20Overwrite%20field%20values,Click%20Save.
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FrozenYeti
1 week, 3 days ago