I don't have an

id

field in my collection. Instead, I have the field

main_key

which is the primary key for multiple collections. Is it possible to specify the

main_key

field while updating the collection with updated

main_key

values in other fields of the documents? Upsert and emplace just create duplicate documents with the

main_key

which is not required. Using

update

results in error

'For update, the 'id' key must be provided.'

.