Changes to Search collection documents

the errors/items/code response's property type changed from integer to string, and format from int32 to no format for status 400

the errors/items/code response's property type changed from integer to string, and format from int32 to no format for status 401

the errors/items/code response's property type changed from integer to string, and format from int32 to no format for status 404

the errors/items/code response's property type changed from integer to string, and format from int32 to no format for status 422

added the optional property errors/items/description to the response with the 400 status

added the optional property errors/items/description to the response with the 401 status

added the optional property errors/items/description to the response with the 404 status

added the optional property errors/items/description to the response with the 422 status

endpoint added