How to decide storage size of an index in Elasticsearch

I want to ask,

How should i decide storage size for an index ? Is there any storage limit for shards or am i able to store 20 gb per shard and will it perform same ?

Thanks for answering and explaining

You can store as much data as you want in a shard. The only limit is the 2^32-1 document count, which is a Lucene level limitation.

We recommend 30-50GB though.

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