Book Image

Learning Elasticsearch

By : Abhishek Andhavarapu
Book Image

Learning Elasticsearch

By: Abhishek Andhavarapu

Overview of this book

Elasticsearch is a modern, fast, distributed, scalable, fault tolerant, and open source search and analytics engine. You can use Elasticsearch for small or large applications with billions of documents. It is built to scale horizontally and can handle both structured and unstructured data. Packed with easy-to- follow examples, this book will ensure you will have a firm understanding of the basics of Elasticsearch and know how to utilize its capabilities efficiently. You will install and set up Elasticsearch and Kibana, and handle documents using the Distributed Document Store. You will see how to query, search, and index your data, and perform aggregation-based analytics with ease. You will see how to use Kibana to explore and visualize your data. Further on, you will learn to handle document relationships, work with geospatial data, and much more, with this easy-to-follow guide. Finally, you will see how you can set up and scale your Elasticsearch clusters in production environments.

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Table of Contents (11 chapters)
Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
Introduction to Elasticsearch
Introduction to Elasticsearch
Basic concepts of Elasticsearch
Interacting with Elasticsearch
How does search work?
Scalability and availability
Summary
2
Setting Up Elasticsearch and Kibana
Setting Up Elasticsearch and Kibana
Installing Elasticsearch
Installing Kibana
Query format used in this book (Kibana Console)
Using cURL or Postman
Health of the cluster
Summary
3
Modeling Your Data and Document Relations
Modeling Your Data and Document Relations
Mapping
Difference between full-text search and exact match
Core data types
Complex data types
Geo data type
Specialized data type
Mapping the same field with different mappings
Handling relations between different document types
Routing
Summary
4
Indexing and Updating Your Data
Indexing and Updating Your Data
Indexing your data
Updating your data
Using Kibana to discover
Using Elasticsearch in your application
Concurrency
Translog
Primary and Replica shards
Summary
5
Organizing Your Data and Bulk Data Ingestion
Organizing Your Data and Bulk Data Ingestion
Bulk operations
Reindex API
Ingest Node
Organizing your data
Shrink API
Summary
6
All About Search
All About Search
Different types of queries
Sample data
Querying Elasticsearch
Relevance
Searching for same value across multiple fields
Caching
Summary
7
More Than a Search Engine (Geofilters, Autocomplete, and More)
More Than a Search Engine (Geofilters, Autocomplete, and More)
Sample data
Correcting typos and spelling mistakes
Making suggestions based on the user input
Highlighting
Handling document relations using parent-child
Handling document relations using nested
Scripting
Post Filter
Reverse search using the percolate query
Geo and Spatial Filtering
Multi search
Search templates
Querying Elasticsearch from Java application
Summary
8
How to Slice and Dice Your Data Using Aggregations
How to Slice and Dice Your Data Using Aggregations
Aggregation basics
Types of aggregations
Using Kibana to visualize aggregations
Caching
Doc values
Field data
Summary
9
Production and Beyond
Production and Beyond
Configuring Elasticsearch
Multinode cluster
How nodes discover each other
X-Pack
Monitoring
Thread pools
Elasticsearch server logs
Summary
10
Exploring Elastic Stack (Elastic Cloud, Security, Graph, and Alerting)
Exploring Elastic Stack (Elastic Cloud, Security, Graph, and Alerting)
Elastic Cloud
Security
Graph
Alerting
Summary

Using Kibana to discover

Kibana UI makes it very easy to explore and visualize your data. You can add filters based on the fields in the document in click of a button and inspect the document source. For each field, you can see the top five values and their field value statistics. In this section, we will discuss how to explore using Kibana. Open Kibana by going to http://localhost:5601/.

Before you can use an index in Kibana, you have to tell Kibana to use an index name or an index pattern. To do this, perform the following steps:

  1. Go to the Management tab on the left.
  2. Select Index Patterns
  3. In the Index Patterns page, select the +Add New button.
  1. Input the index name as chapter4, and select the time-field name as last_modified_date.
  2. Click on Create.

Now go to the Discover tab on the left navigation bar, and you should see a screen as shown here:

Since we configured the time...

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