anchor.diff:  `-Pvagrant.windows-2016=another-image-id`
   
   These properties are required for Windows support in all gradle tasks that
  -handle packaging tests. Either or both may be specified. Remember that to run tests
  -on these boxes, the project property `vagrant.boxes` still needs to be set to a
  -value that will include them.
  +handle packaging tests. Either or both may be specified.
   
   If you're running vagrant commands outside of gradle, specify the Windows boxes
   with the environment variables
  
positive.code: == Test coverage analysis
  
  Generating test coverage reports for Elasticsearch is currently not possible through Gradle.
  However, it _is_ possible to gain insight in code coverage using IntelliJ's built-in coverage 
  analysis tool that can measure coverage upon executing specific tests. Eclipse may also be able
  to do the same using the EclEmma plugin.
  
  
negative.code: 
  === Load balancing and caches.
  
  By default the tests run on multiple processes using all the available cores on all
  available CPUs. Not including hyper-threading.
  If you want to explicitly specify the number of JVMs you can do so on the command
  line:
  