Not able to find default value of number-of-shards anywhere.
akka.cluster.sharding {
# Number of shards used by the default HashCodeMessageExtractor
# when no other message extractor is defined. This value must be
# the same for all nodes in the cluster and that is verified by
# configuration check when joining. Changing the value requires
# stopping all nodes in the cluster.
number-of-shards = 1000
}
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