Splunk's scrub command scrub data in queries/report. What are the steps to permanently remove certain logs from Splunk? I imagine it'd require re-generating the index.
You can take a search and
| delete to delete the results of that search from the index. Your account needs the
can_delete privilege. Strictly speaking, this does not remove it from the index so much as mark it as deleted. It remains in the on-disc bucket structure and could be located in there using traditional filesystem tools - but it would not be searchable in Splunk any more.
To really clean, you would have to export the data you want to keep out of the index using command line
splunk export (possibly after doing
| delete) then import back in with