Chapter 7. Administrating Your Cluster

In the previous chapter, we've mainly looked at how to use the faceting functionality in ElasticSearch, which allowed us to get aggregated statistics about our search results. In addition to that, we've learned how to use the "more like this" REST endpoint to get a similar document to the ones we've found, and in addition to that we've also used the prospective search functionality called the percolator to store queries and check which queries matched the document sent to ElasticSearch. In this chapter, we will take a look at cluster health and cluster state monitoring. We will learn how to use tools to diagnose the state of our cluster. We will also use the shard and replica allocation mechanism to control the nodes on which they are placed by ElasticSearch. Finally we will learn what the gateway and discovery modules are and how to configure them. By the end of this chapter you will have learned:

• How to monitor your cluster state and health

• How to...