Elastic have announced [1] that embedded Elasticsearch is no longer
supported. This commit brings us into line with that announcement by
removing the auto-configuration that would create an Elasticsearch
Node and NodeClient.
To use the Elasticsearch auto-configuration, a user must now provide
the address of one or more cluster nodes
(via the spring.elastisearch.cluster-nodes property) which will then
be used to create a TransportClient.
See gh-9374
[1] https://www.elastic.co/blog/elasticsearch-the-server
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
