Terms_stats mode not returning results - generating Elasticsearch error

Hi,

We're using Kibana here for the first time and want to aggregate stats by
adding up a total ("SizeMB") for each user ("DisplayName").

When we set the value field as "SizeMB" and the field as "Display Name",
ElasticSearch throws a Parse Failure.

Can anyone get this to work, or are we likely to be doing something
fundamentally wrong / stupid?

Thanks,

Ben

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