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Can search on content_source_type:

but not on content_uuid or site_uuid:

And yet they have the same type in schema:

Maybe it needs to be set to not analyzed, maybe it is splitting up the string: https://www.elastic.co/guide/en/elasticsearch/guide/current/mapping-intro.html#_index_2

Ok, yeah that field content_uuid is being analyzed:

Though, I feel like this should still work.