Introduction

Scala is becoming one of the most used languages in big data scenarios. This language provides a lot of facilities for managing data, such as immutability and functional programming.

In Scala, you can simply use the libraries seen in the previous chapter for Java, but they are not scalastic as they don't provide type safety (because many of these libraries take a JSON as a string) and it is easy to use asynchronous programming.

In this chapter, will see how to use elastic4s, a mature library, to use Elasticsearch in Scala. Its main features are:

• Type safe concise DSL

• Integrates with standard Scala futures

• Uses the Scala collections library over Java collections

• Returns option where the Java methods would return null

• Uses Scala durations instead of strings/longs for time values

• Uses typeclass for marshalling and unmarshalling classes to/from Elasticsearch documents, backed by Jackson, Circe, Json4s, and PlayJson implementations

• Leverages the built-in Java client

• Provides reactive-streams...