Hi Oliver, did you ever get round to solving this?
I'm having the same issue with http://ransomwaretracker.abuse.ch/feeds/csv/
I've tried renaming the fields using regex and the field transforms, but no luck so far!
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Did you get this resolved? Have you limited your datamodels to only creating their summaries from the indexes they require? This saved us a huge amount of resource when we implemented it.
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