DATAES-238 - Fix ElasticsearchTemplate.prepareUpdate(): preserve routing

* need to specify Locale.ENGLISH in String.format()
  to make tests succeed on non-english locales

* that's because the String.format involves floating
  point numbers which are formatted differently in
  some locales

* ElasticsearchTemplate.prepareUpdate() properly copies routing
  from given UpdateRequest

* add unit tests to ElasticsearchTemplateParentChildTests
  for update of a child document

src/main/java/org/springframework/data/elasticsearch/core/ElasticsearchTemplate.java

@@ -538,6 +538,7 @@ public class ElasticsearchTemplate implements ElasticsearchOperations, Applicati
 		Assert.notNull(query.getId(), "No Id define for Query");
 		Assert.notNull(query.getUpdateRequest(), "No IndexRequest define for Query");
 		UpdateRequestBuilder updateRequestBuilder = client.prepareUpdate(indexName, type, query.getId());
+		updateRequestBuilder.setRouting(query.getUpdateRequest().routing());
 
 		if (query.getUpdateRequest().script() == null) {
 			// doc