How to choose number of max threadpools for snapshots

Elastic Stack Elasticsearch
1

We have an elasticsearch cluster with 15 data nodes each with almost 9TB data to get snapshotted.
Disk max_snapshot_Bytes_per_second is 250MB/sec.
cpu -> 4 cores
ES_JAVA_OPTS -> -Xms10240m -Xmx10240m

2

Use the default.

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