If you are a beginner to the world of full-text search and Elasticsearch, then this book is especially for you. You will be guided through the basics of Elasticsearch and you will learn how to use some of the advanced functionalities.
If you know Elasticsearch and you worked with it, then you may find this book interesting as it provides a nice overview of all the functionalities with examples and descriptions. However, you may encounter sections that you already know.
If you know the Apache Solr search engine, this book can also be used to compare some functionalities of Apache Solr and Elasticsearch. This may give you the knowledge about which tool is more appropriate for your use case.
If you know all the details about Elasticsearch ...