A field alias is a knowledge object that maps a non-standard field name to a CIM field name. A field alias allows you to use the same search string to retrieve data from different data sources, even if the data sources use different field names for the same type of data. For example, if you have data sources that use different field names for the source IP address, such as src_ip, source_ip, or sip, you can create a field alias that maps these field names to the CIM field name src. This way, you can use src as a common field name in your searches and reports, and Splunk will automatically replace it with the appropriate field name for each data source. Field aliases are applied at search time, so they do not affect the original data or the index time field extractions. References =
Normalizing values to a common field name with the Common Information Model (CIM)
Field aliases
Onboarding data to Splunk Enterprise Security
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