600 shards configuration is proven to work.
There is evidence that 1000 shards work.
It starts to slow down short queries significantly. On 600 shards
config, the queries always take no less than 100ms.
If you use only one replica, you will also have to turn on the
"skip_unavailable_shards" setting.
10 000 shards may work but overhead for a single query will be too high.
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