DATAES-802 - Update documentation for using scroll API with repository methods.

Original PR: spring-projects#440

Author: JBodkin

src/main/asciidoc/reference/elasticsearch-misc.adoc

@@ -80,6 +80,17 @@ while (scroll.hasSearchHits()) {
 template.searchScrollClear(scrollId);
 ----
 
+Additionally, the scroll API can be used by defining the return type as `Stream` in the Elasticsearch Repository.
+
+[source,java]
+----
+interface SampleEntityRepository extends Repository<SampleEntity, String> {
+
+    Stream<SampleEntity> findBy();
+
+}
+----
+
 [[elasticsearch.misc.sorts]]
 == Sort options