Advanced search is not working. I've narrowed it down to a multi select attribute not being indexed correctly. I've tested by manually adding a record to catalog_product_index_eav table. Once I manually add it, the advanced search finds it. If I reindex, its no longer found.
After data migration, I have a couple of multi select attributes that the indexer is not indexing correctly. From what I understand, if eav_attribute.backend_type is set to varchar, it should see it in catalog_product_entity_varchar. Its not there, but I have found it in catalog_product_entity_text.