As per our discussion during the F2F
We would use to Elasticsearch's "null_value" concept, and something similar in the Lucene backend.
Note this does not mean we give up the concept of "exists"/"missing" predicates (
). We will handle that separately.
Remove support for "default" null tokens
Support "exists" predicate for @IndexedEmbedded
Add support for "missing"/"exists" predicates
Drop support for @IndexedEmbedded.indexNullAs