N1QL update with CAS

Hi graham
suppose document is "{
“hote1”:{
“city”:“Delhi”
},
“hotel2”:{
“city”:“Bangalore”
}
}

when i write update myucket set hotel1.city=“Bangalore” where hotel1.city=“Delhi”
will updates on hotel1 and concurrent updates like this on hotel2
will result in concurrent update exception
or its equivalent to subdoc APIs