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

If you have a large index, you should use a default value

   <field ... default="EMPTY" />

and then query for this default value. This is much more efficient than q=-id:["" TO *]