Book Image

Elasticsearch 7.0 Cookbook - Fourth Edition

By : Alberto Paro
Book Image

Elasticsearch 7.0 Cookbook - Fourth Edition

By: Alberto Paro

Overview of this book

Elasticsearch is a Lucene-based distributed search server that allows users to index and search unstructured content with petabytes of data. With this book, you'll be guided through comprehensive recipes on what's new in Elasticsearch 7, and see how to create and run complex queries and analytics. Packed with recipes on performing index mapping, aggregation, and scripting using Elasticsearch, this fourth edition of Elasticsearch Cookbook will get you acquainted with numerous solutions and quick techniques for performing both every day and uncommon tasks such as deploying Elasticsearch nodes, integrating other tools to Elasticsearch, and creating different visualizations. You will install Kibana to monitor a cluster and also extend it using a variety of plugins. Finally, you will integrate your Java, Scala, Python, and big data applications such as Apache Spark and Pig with Elasticsearch, and create efficient data applications powered by enhanced functionalities and custom plugins. By the end of this book, you will have gained in-depth knowledge of implementing Elasticsearch architecture, and you'll be able to manage, search, and store data efficiently and effectively using Elasticsearch.
Table of Contents (23 chapters)
Title Page

Using span queries

The big difference between standard databases (SQL, and also many NoSQL databases, such as MongoDB, Riak, or CouchDB) and Elasticsearch is the number of facilities to express text queries. The span query family is a group of queries that control a sequence of text tokens using their positions: the standard queries don't take care of the positional presence of text tokens.

Span queries allow the defining of several kinds of queries:

  • The exact phrase query
  • The exact fragment query (that is, take off and give up)
  • Partial exact phrase with a slop (other tokens between the searched terms, that is, the man with slop 2 can also match the strong man, the old wise man, and so on).

Getting ready

You need an up-and...