In the final event that was exported to Elasticsearch, what is the value of the FirstNotifiedAt field? I'm not seeing anything obvious from your pattern and the string you pasted in the comment above it
I think this is an issue in the way the csv is produced.
It's a little peculiar as the csv shows the FirstNotifiedAt as a 'custom' format in excel. It is formatted 31/03/2018 23:56:00
There is a double space between date and time
There is a :ss
I haven't changed the csv (the export from the software needs to be automated and altering the csv format is a non starter)...losing the :ss isn't critical for my purposes so I guess I'm happy.
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