How to extract fields from a specific field instead of raw data using the conf files? Can it be done with EXTRACT-<class> = [<regex>|<regex> in <src_field>] in props.conf?
The extract fields command only works on raw data with transforms.conf however not with index data. The extractions is done via kv_mode=auto for the fields.
Looks like this has already been answered here: https://answers.splunk.com/answers/47982/extracting-field-from-a-field-other-than-raw-in-props-conf....
You need to use transforms configuration instead.
Hope this helps.