Polish 'Inherit show-details property in health groups'

Rework the inheritance so that the property metadata JSON more
accurately reflects the default value.

See gh-22022

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/HealthEndpointProperties.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -33,11 +33,25 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
 @ConfigurationProperties("management.endpoint.health")
 public class HealthEndpointProperties extends HealthProperties {
 
+	/**
+	 * When to show full health details.
+	 */
+	private Show showDetails = Show.NEVER;
+
 	/**
 	 * Health endpoint groups.
 	 */
 	private Map<String, Group> group = new LinkedHashMap<>();
 
+	@Override
+	public Show getShowDetails() {
+		return this.showDetails;
+	}
+
+	public void setShowDetails(Show showDetails) {
+		this.showDetails = showDetails;
+	}
+
 	public Map<String, Group> getGroup() {
 		return this.group;
 	}
@@ -58,7 +72,8 @@ public class HealthEndpointProperties extends HealthProperties {
 		private Set<String> exclude;
 
 		/**
-		 * The default value of this field should be null for group.
+		 * When to show full health details. Defaults to the value of
+		 * 'management.endpoint.health.show-details'.
 		 */
 		private Show showDetails;
 
@@ -83,7 +98,6 @@ public class HealthEndpointProperties extends HealthProperties {
 			return this.showDetails;
 		}
 
-		@Override
 		public void setShowDetails(Show showDetails) {
 			this.showDetails = showDetails;
 		}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/HealthProperties.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -43,11 +43,6 @@ public abstract class HealthProperties {
 	 */
 	private Show showComponents;
 
-	/**
-	 * When to show full health details.
-	 */
-	private Show showDetails = Show.NEVER;
-
 	/**
 	 * Roles used to determine whether or not a user is authorized to be shown details.
 	 * When empty, all authenticated users are authorized.
@@ -66,13 +61,7 @@ public abstract class HealthProperties {
 		this.showComponents = showComponents;
 	}
 
-	public Show getShowDetails() {
-		return this.showDetails;
-	}
-
-	public void setShowDetails(Show showDetails) {
-		this.showDetails = showDetails;
-	}
+	public abstract Show getShowDetails();
 
 	public Set<String> getRoles() {
 		return this.roles;

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/health/AutoConfiguredHealthEndpointGroupsTests.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -310,7 +310,7 @@ class AutoConfiguredHealthEndpointGroupsTests {
 	}
 
 	@Test
-	void createWhenNoDefinedGroupsShowDetails() {
+	void createWhenGroupWithNoShowDetailsOverrideInheritsShowDetails() {
 		this.contextRunner.withPropertyValues("management.endpoint.health.show-details=always",
 				"management.endpoint.health.group.a.include=*").run((context) -> {
 					HealthEndpointGroups groups = context.getBean(HealthEndpointGroups.class);