Mock elasticsearch with mock-server

In a Apache Spark Java project, that must send data to elasticsearch with the official plugin elasticsearch-hadoop (http://github.com/elastic/elasticsearch-hadoop/) I use junit to perfom unit-test.

Since elasticsearch represents less than 5% of data in the project, I don’t want to launch a real ES server but mock it, so we can perform HTTP queries without trouble.

http://www.mock-server.com/ is a very simple Java library that use Netty to create a real HTTP server where you can add rules (query and response).

First, we must define what elasticsearch services we want mock:

• “/” => give version
• “*/_search” => give documents
• “*/_count” => give count
• etc..

Here an example:

Of course, this is a basic example, this does nothing. You can modify it to fit your test workflow and indices/data.