In the chapter we just finished, we learned a few very important things about Elasticsearch. First of all, we learned how we can configure the node discovery mechanism. In addition to that, we learned to control what happens after the cluster is initially formed using the recovery and gateway modules. We used dynamic and non-dynamic templates to handle our indices more easily, and we learned what type of caches Elasticsearch has and how to control them. Finally, we used the update settings API to update the various Elasticsearch configuration variables on an already live cluster.

In the next chapter, we will focus on cluster administration. We will start with learning how to backup our data and how to monitor the key cluster metrics. We'll see the way to control cluster rebalancing and shard allocation, and we will use a human friendly Cat API that allows us to get varied information about the cluster. Finally, we will learn about warming up our indices and aliasing.