What should my cluster heap to storage ratio be? How many shards should I have per node? How big should my shards be? How many data nodes do I need? All these questions and more are very common for anyone designing their first Elasticsearch cluster. Unfortunately, there are no clear cut answers to any of these questions but there are some general guildelines you can follow to make sure your on the right track. In this lesson, we go over some of these best practicies for designing and sizing an Elasticsearch cluster.