Is the book "ElasticSearch in Action" still relevant? It was published back in 2015, so it's a solid 5 years old - which is ages in the software world. I'm looking for a book that will get me deeper into understanding ES and what's I've read of the book makes me think it would do this. I'm just concerned that it would be out-of-date. Most other books on ES are either just as old, get bad reviews, or are published by Packt (who publishes exceptionally low-quality books). So, if anyone has another resource, I'm all ears.
Lot of APIs changed or will change in the near future but most of the book ideas are still relevant.
The book is still a very good resource for learning IMHO.
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