By default, Elasticsearch writes it data to ./data. This led to data
being left on the filesystem after a mvn clean which could cause
failures when moving between branches that use different versions of
Elasticsearch.
This commit updates the tests for the Elasticsearch sample and
the Elasticsearch auto-configuration classes to write the
Elasticsearch data and logs into the target directory.
Update ElasticsearchAutoConfiguration to ensure that local nodes are
closed when the context is closed. Prior to this commit the close()
method of the Client would be called which had no effect for local
Nodes.
Fixes gh-2480
