Via the api, multi select options were accidentally inserted as duplicates. So instead of 11111,22222 being stored in catalog_product_entity_text.value it was submitted as 11111,22222,11111,22222 and stored as such. This causes the indexer to break with duplicate errors. SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '681306-12156-1-7638991-681306' for key 'PRIMARY', query was: […]