How to set the shard and replica to tune the ES performance?

Hi everyone, my everyday documents is about 20 million records and one index per day.
I know the default setting is 5 shards 1 replica per index.
should I change the setting such as 3 shards and 2 replica, and does the setting performance be better or not?
How can I tune the shards and replica to improve my ES system performance and maintain the durability?
btw, I set 4 nodes in a cluster.

thank you in advance!

Have you tested it?

No.because I don't know what setting is the best.
I have no concept :frowning:

my index is about logstash-2018.01.31 logstash-2018.01.30 logstash-2018.01.29......
Is this setting can affect all the index include future index which is logstash-*?

PUT /logstash-*/_settings
    "index" : {
        "number_of_replicas" : 1

May I suggest you look at the following resources about sizing:

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