This is not a Elasticsearch focused book. Rather, it is using ES as a tool in order to provide an concrete and practical walkthrough about how to achieve semant

This is not a Elasticsearch focused book. Rather, it is using ES as a tool in order to provide an concrete and practical walkthrough about how to achieve semantic relevancy in real world application. It is not concerning too much about the engineering side of ES, e.g. Master/Datanode or replication that kind of stuff, but more on the quality of text search. As the author has put, you could use Solr but will still find this book relevant(sorry) to you.