In the previous chapter, we looked at the discovery and recovery modules' configuration. We configured these modules and learned why they are important. We also saw additional discovery implementations available through plugins. We used the human-friendly Cat API to get information about the cluster in a human-readable form. We backed up our data to the external cloud storage, and we discussed tribe nodes—a federated search functionality allowing you to connect several Elasticsearch clusters together. By the end of this chapter, you will have learned the following things:
What doc values can help us with when it comes to queries that are based on field data cache
How garbage collector works
How to benchmark your queries and fix performance problems before going to production
What is the Hot Threads API and how it can help you with problems' diagnosis
How to scale Elasticsearch and what to look at when doing that
Preparing Elasticsearch for high querying throughput...