Elasticsearch 7.0 Cookbook: Over 100 recipes for fast, scalable, and reliable search for your enterprise, 4th Edition

I like this book and at the time of purchase it was like the only version 7.x available although I have to mention there couple pieces that are wrong. Cluster discovery changed in version 7 yet this book point at the older methods....anyway other than that small hiccup it is good for CCQs and Java HLRC though it doesn’t get super deep.