Sankey visualisation (Vega) - _aggregations is undefined

So I copied the vega code from this blog post and changed the source/destination fields to ones found in our indices. It's been useful to identify unusual traffic in our firewall logs.
It's been working fine until 6.5/6.6 when I started getting the error _.aggregations is undefined.
It'd be great to get some help.

@nyuriks - can you help here please ?


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