Book Image

Elasticsearch Indexing

By : Huseyin Akdogan
Book Image

Elasticsearch Indexing

By: Huseyin Akdogan

Overview of this book

Beginning with an overview of the way ElasticSearch stores data, you’ll begin to extend your knowledge to tackle indexing and mapping, and learn how to configure ElasticSearch to meet your users’ needs. You’ll then find out how to use analysis and analyzers for greater intelligence in how you organize and pull up search results – to guarantee that every search query is met with the relevant results! You’ll explore the anatomy of an ElasticSearch cluster, and learn how to set up configurations that give you optimum availability as well as scalability. Once you’ve learned how these elements work, you’ll find real-world solutions to help you improve indexing performance, as well as tips and guidance on safety so you can back up and restore data. Once you’ve learned each component outlined throughout, you will be confident that you can help to deliver an improved search experience – exactly what modern users demand and expect.
Table of Contents (15 chapters)
Elasticsearch Indexing
About the Author
About the Reviewer

ICU analysis plugin

Elasticsearch has an ICU analysis plugin. You can use this plugin to use mentioned forms in the previous section, and so ensuring that all of your tokens are in the same form. Note that the plugin must be compatible with the version of Elasticsearch in your machine:

bin/plugin install elasticsearch/elasticsearch-analysis-icu/2.7.0

After installing, the plugin registers itself by default under icu_normalizer or icuNormalizer. You can see an example of the usage as follows:

curl -XPUT /my_index -d '{
  "settings": {
    "analysis": {
      "filter": {
        "nfkc_normalizer": {
          "type": "icu_normalizer",
          "name": "nfkc"
      "analyzer": {
        "my_normalizer": {
          "tokenizer": "icu_tokenizer",
          "filter":  [ "nfkc_normalizer" ]

The preceding configuration let's normalize all tokens into the NFKC normalization form.


If you want more information about the ICU, refer to