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In my experience as you are learning to use ElasticSearch during an implementation, or even going back to reference there is a high-ish probability you will need the manual and the definitive guide. Really, I think they ought to be combined in some way because there are huge gaps in the docs.

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I bought the book and I'll say I was disappointed with the book. A couple of points, though. 1. The topic is huge, it's hard to cover everything because the way you can query and setup your mappings is really very open-ended. 2. The book is a good way to get started, but it lacks as a reference. See point 1., a reference may not be possible.

The best way to learn ES is to set yourself up with a scripting language (python, ruby, etc.) and prototype everything, then apply what you learned to your language of chocie (i.e. Java if the scripting language isn't your language of choice).

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