Snapshot always runs on primary shards?

Elastic Stack Elasticsearch
1

I wanted to know if the snapshots always run from the nodes holding the primary shards of the indices which are being snapshotted?

Why I want to know this?
There is a setting of "max_snapshot_bytes_per_sec" which restricts the bandwidth utilisation per node. I have a restriction on the overall bandwidth being used by the entire cluster to be limited at 200MBPS. So I find out all the unique nodes which are holding the primary shards of all the indices being backed up and then set max_snapshot_bytes_per_sec as (200/NoOfNodes).

Wanted to know if this assumption is correct.

2

yes, we currently only snapshot primaries (see also https://github.com/elastic/elasticsearch/issues/18866)

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