Fix test YAML config ES version

Author: stevejgordon

tests/Tests.Configuration/tests.default.yaml

@@ -9,7 +9,7 @@ mode: u
 
 # the elasticsearch version that should be started
 # Can be a snapshot version of sonatype or "latest" to get the latest snapshot of sonatype
-elasticsearch_version: latest
+elasticsearch_version: latest-7
 # cluster filter allows you to only run the integration tests of a particular cluster (cluster suffix not needed)
 # cluster_filter:
 # whether we want to forcefully reseed on the node, if you are starting the tests with a node already running