Summary

In this chapter, we started with different Apache Lucene scoring algorithms and learned about how to alter them and how to choose the right algorithm. Then we went through the store module of Elasticsearch and learned about different directory implementations for indices. We also covered near real-time searches, indexing, and learned about transaction logs configurations. Then, we looked into how segment merging works and what are all the possible ways to control the merge process. At the end, we discussed caching in Elasticsearch and the roles of circuit breakers.

Our next chapter is going to be a very important as well as interesting chapter as it focuses on Elasticsearch administration concepts. We will discuss Elasticsearch discovery, including the Amazon EC2 discovery module and the Elasticsearch recovery module, which helps users to configure them as per need. We will also cover the major changes done in Elasticsearch monitoring and then we will discuss the CAT API in detail...