For some reason as I see in case of updates of the old events Splunk writes the change into the _audit index. You can access to it by this search index=_audit source=mc_notes
| rex "(?<timestamp>[\d.]+),(?<incident_id>[\w-]+),(?<user>[\w_]+),(?<model>[\w]+),(?<command>[\w]+),(?<diff>.+)"
| eval time=_time
| table time, user, incident_id, diff, command
| rex field=diff mode=sed "s/\\\\//g"
| rex field=diff mode=sed "s/^\"//g"
| rex field=diff mode=sed "s/\"$//g"
| spath input=diff
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