How to know an index has completed updating

SQL++
1

If a large amount of documents are inserted into couchbase (say 1 million) and they all have the same unique version tag. What is the best way to know that the indexer has finished indexing all of those documents of that version?

Would a simple select query to get a count of the number of documents of that version be enough to know that all of the indexes have finished indexing that version?

For example when select count(*) from bucket where version = ‘10’
If count is 1 million, then I can assume all the indexes have caught up?

2

If the version is leading index key the above query can be used.

3

Do all indexes get updated at the same time when new records are added? When the indexer reviews a new document does it consider that document for all of the indexes at once or does each index pull a copy of the document separately to determine if it should be indexed?

4

all indexes on the same index service node and belonging to the same bucket get updated together.