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Query historic process by a null value

Question asked by stckcrsh on Aug 11, 2014
I am trying to query the historic process instances and I need to grab all results that have the variable superProcessInstanceId equal to null.

I have tried to set the query as such
{"superProcessInstanceId":null,
"includeProcessVariables":false}

and this just returns all results.

Is there a way to search for items that have null values?

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