Kibana query language - how do I filter fieldA>fieldB

I want to filter my ES data via Kibana by comparing 2 numeric fields.
Sample record:
fieldA=25 fieldB=38 msg=whatever

I need a way to show only records where fieldA>fieldB

The only suggestion I found so far is fieldA:[@fieldB TO *]
However, this doesn't work - I get no results, although I see records
which should meet this criteria

I'm running Kibana4 beta3

Thanks,
Gregory

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