Best practice for Index and Shard Size

what is the best practice for index and shard size? I found sources that state that a good shard size is 10-30GB. But what is a good index size? I have timeseries data of over 300 GB split into 5 Indices and I am restoring it from snapshots. Now I want to find out if i should build 5 big Indices of up to 200GB with 5-10Shards each or if I should split this data into many indices of lets say 50GB.

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