Hist to add some more information on bootstrap. For large deployments, customer get concerned while running bootstrap when env have millions of buckets.
As you know, bootstrapping would ensure that buckets which are already present on cluster would not be created again on the cluster.
bootstrapping would just list all the buckets on S3 and would then create the buckets which are not present on the cluster.
It is usually quick as well.
Hence if the customer is only missing few buckets on the cluster, we can initiate bootstrapping and it would create these buckets.
Noe for the Question : List all buckets on s3 for 7 million buckets -> is that still ok / fairly safe / quick?
if we do want to discover these buckets, bootstrapping is the only option currently.
it is not supported per index.
the entire operation is detached from the usual operations of CM - it is safe and quick as well.
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