to completely refresh and clean notable events , you can do the following (try this in test first, not prod) :
How to wipe all events from indexes and kvstores and start over
$SPLUNK_HOME/bin/splunk stop
$SPLUNK_HOME/bin/splunk clean eventdata -index itsi_tracked_alerts;
$SPLUNK_HOME/bin/splunk clean eventdata -index itsi_grouped_alerts;
$SPLUNK_HOME/bin/splunk start
$SPLUNK_HOME/bin/splunk clean kvstore -app SA-ITOA -collection itsi_notable_event_group
$SPLUNK_HOME/bin/splunk clean kvstore -app SA-ITOA -collection itsi_notable_event_state
$SPLUNK_HOME/bin/splunk clean kvstore -app SA-ITOA -collection itsi_notable_event_tag
$SPLUNK_HOME/bin/splunk clean kvstore -app SA-ITOA -collection itsi_notable_event_comment
$SPLUNK_HOME/bin/splunk clean kvstore -app SA-ITOA -collection itsi_notable_event_ticketing
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