Increasing primary shards number


I have a three nodes cluster: one dedicated master no data, and two others are data nodes one for HOT and the second one for Warm data. In my use case having replicas isn't necessary so I have one shard per index. My question is:
increasing primary shards on the same node increases the indexing throughput but how does it affect search speed ?

Thank you

As a rule of thumb, more shards mean faster indexing, less means faster querying.

If you have hot/warm data tiering, consider using ILM to manage it, as you can shrink warm indices down to a single shard.

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Thank a lot
Have a nice day

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