Changes to GET /search

the response property links/prev became nullable for the status 200

the response property links/self became nullable for the status 200

the data/items/overviews response's property type changed from array to object for status 200

the data/items/translations response's property type changed from array to object for status 200

added the non-success response with the status 400

added the optional property links to the response with the 200 status