Polish "Fix stopping of Embedded Mongo before context is closed"

See gh-15692

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/embedded/EmbeddedMongoAutoConfiguration.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/embedded/EmbeddedMongoAutoConfigurationTests.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@ import java.util.EnumSet;
 import java.util.stream.Collectors;
 
 import com.mongodb.MongoClient;
+import de.flapdoodle.embed.mongo.MongodExecutable;
 import de.flapdoodle.embed.mongo.config.IMongodConfig;
 import de.flapdoodle.embed.mongo.config.Storage;
 import de.flapdoodle.embed.mongo.distribution.Feature;
@@ -174,6 +175,13 @@ public class EmbeddedMongoAutoConfigurationTests {
 						.isEqualTo("testing");
 	}
 
+	@Test
+	public void shutdownHookIsNotRegistered() {
+		load();
+		assertThat(this.context.getBean(MongodExecutable.class).isRegisteredJobKiller())
+				.isFalse();
+	}
+
 	private void assertVersionConfiguration(String configuredVersion,
 			String expectedVersion) {
 		this.context = new AnnotationConfigApplicationContext();