Can I have multiple Shards per node?


Right now I have only one server for elasticsearch which has one index ( with default 5 shards).
Approx I will have 4 million documents for one month. I have created a time based index with time frame of 3 months, which means I will have approx 12 million documents for 3 months. With these

  1. Will it cause severe performance issue in Kibana if I store all data in one index??
  2. Also since by default elastic search creates 5 shards, will I get any performance benefits even if I have only one node


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