Backwards compatibility tests involving the current version being built and some previous version
'org.elasticsearch.qa.backwards:two-versions-parent:2.1.1'
<dependency>
<groupId>org.elasticsearch.qa.backwards</groupId>
<artifactId>two-versions-parent</artifactId>
<version>2.1.1</version>
</dependency>
<dependency org="org.elasticsearch.qa.backwards" name="two-versions-parent" rev="2.1.1"/>
"org.elasticsearch.qa.backwards", "two-versions-parent", "2.1.1"