How to query SOLR for empty fields?

Question

I have a large solr index, and I have noticed some fields are not updated correctly (the index is dynamic).

This has resulted in some fields having an empty \"id\" f

Answer 1

One caveat! If you want to compose this via OR or AND you cannot use it in this form:

-myfield:*

but you must use

(*:* NOT myfield:*)

This form is perfectly composable. Apparently SOLR will expand the first form to the second, but only when it is a top node. Hope this saves you some time!