UNNEST is self join of actual document with array element
For object use dot field i.e. i.element.id
SELECT i.validationLogicId, i.businessValidationId, i.`element`.id, i.severity
FROM businessValidation AS i
UNNEST is self join of actual document with array element
For object use dot field i.e. i.element.id
SELECT i.validationLogicId, i.businessValidationId, i.`element`.id, i.severity
FROM businessValidation AS i