To find all incidents that have a value assigned to EmailThreads, you can use this filter:
This shows all incidents where the EmailThreads fields is not empty. This relies on the machine name of the field so if it is not emailthreads you will need to adjust it. Hope this helps!
In that screenshot, ExtractedFields is in the context of the incident but is not being used as a field in the incident. Only incident fields are indexed and are filterable since the amount of data in context can be overwhelming. Only the subset of data under incident can be used to filter. In its current state you can't filter based on ExtractedFields, you would need to create it as an incident field first, then it would be filterable.
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