Is it possible to filter a document by the value provided only if the document has the field.
For context,
I have document types A,B,C that have the field.
I also have document types D and E that don't.
I could define a query such that the filter only applies to the first subset, but I might later add a new document type to the first set which will invalidate this filter.
You'll have to combine the query with an match against all documents, except those who have a value in the field:
myfield:foobar OR (*:* NOT myfield:*)
.. should do what you want. That being said, I'd probably wait to introduce these additional queries until I actually see that it's needed, as it will make each query more expensive without possibly being necessary in the future - but that's up to your judgement.
