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Querying elasticsearch can be very confusing, especially when you are just starting to work with the engine. In this article, I would like to give you a jump-start and simplify this subject. Elasticsearch has built-in analyzers and you can also build your own custom analyzer. The result of the indexing process is an inverted index: "Doc_1 — “in the summer the quick brown fox jump over the lazy dog” The index is mapped to the corresponding documents.