This chapter covered the most important aspects of search engines; that is, relevancy. We discussed the powerful scoring capabilities available in Elasticsearch and the practical examples to show how you can control the scoring process according to your needs. Despite the relevancy challenges faced while working with search engines, the out-of-the-box features such as function scores and custom scoring always allow us to tackle challenges with ease.

In the next chapter, you will learn how to set up an Elasticsearch cluster and configure different types of node for production deployments.