This is for Splunk Enterprise but it essentially applies for Splunk Cloud as well: Immutability of indexed data Once data has been added to an index, you cannot edit or otherwise change the data. You can delete all data from an index or you can delete, and optionally archive, individual index buckets based on policy, but you cannot selectively delete individual events from storage. https://help.splunk.com/en/splunk-enterprise/administer/manage-indexers-and-indexer-clusters/10.4/indexing-overview/how-indexing-works#ariaid-title3
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