@sathwikr076 to be able to resolve this issue - will be better to send a support ticket to support@outcoldsolutions.com
The reason for this error is that HEC does not have access to write to this index, or this index does not exist on Splunk. Depending on the version of Collectord you are using, you can configure incorrect index behavior with the configuration, see https://www.outcoldsolutions.com/docs/monitoring-kubernetes/v5/splunk-output/#http-event-collector-incorrect-index-behavior
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