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

Basic concepts and definitions

As stated in the previous chapter, mapping is the process of defining how a document should be mapped to Elasticsearch (if you don't recall, please refer to the Mapping section in the previous chapter). How a field is tokenized, analyzed, and searchable can be found using the mapping mechanism. Keep in mind that mapping is actually a schema definition (we will examine it in detail at the end of this chapter).

Now let's review the basic concepts and definitions.

Metadata fields

All the fields are not returned to us when a document is requested but each document has auto-generated metadata fields with each mapping which have information about the document that allows us to control how the metadata document is indexed. For example, which fields will return with the query results, how long the document will live, and so on.

We will now examine some of those fields.


We have already talked at length about the _source field in Chapter 1, Introduction to Efficient...