I've only read this and the Definitive Guide to ES. "Relevant Search" is more focused on working through how to tune search results and understand why things ar

I've only read this and the Definitive Guide to ES. "Relevant Search" is more focused on working through how to tune search results and understand why things are happening and how you can make them work in your favor. They work through a lot of great examples and go much deeper than anything else I've come across.