Hello, first time poster here so be gentle with me 
When creating a Visualisation (for example: Lens - Top Values), there is an option to pick a field and in "Advanced" section to check "Include documents without this field".
When I want to use a Number field, this checkbox is disabled for me. Is this expected and why is that?
Challenge that I have is that if I want to show 2 number fields on the same dashboard in similar manner, I have a challenge that these two fields are mutually excluding one another in a way that some records have field1 set and other have field2 set. Since I cannot pick "Include documents without this field", I end up without any field.
Is there any workaround for this?
Kind Regards