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Elasticsearch 7 Quick Start Guide

You're reading from   Elasticsearch 7 Quick Start Guide Get up and running with the distributed search and analytics capabilities of Elasticsearch

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Product type Paperback
Published in Oct 2019
Publisher Packt
ISBN-13 9781789803327
Length 186 pages
Edition 1st Edition
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Authors (2):
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Douglas Miller Douglas Miller
Author Profile Icon Douglas Miller
Douglas Miller
Anurag Srivastava Anurag Srivastava
Author Profile Icon Anurag Srivastava
Anurag Srivastava
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Toc

Anatomy of an analyzer

An analyzer is a package that contains three building blocks: character filters, tokenizers, and token filters. A user can create a custom analyzer by using these or other building blocks to create the functionality needed. Allow me to elaborate more on what these building blocks are:

  • Character filters convert text into a stream of characters. They can transform the stream by adding, removing, or changing the format of the characters. For example, a character filer can change the & character to the word and. An analyzer may have no character filters, or many, but they are always applied in order.
  • Tokenizers receive the stream of characters and break it down into tokens. The output will then be a stream of tokens. For example, a whitespace tokenizer breaks the text using whitespaces: Hello World! into [hello, world]. It also records the order of the...
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