Apply configuration properties deprecation consistently

This commit makes sure that both the getter and the setter of a
deprecated configuration properties is flagged with `@Deprecated`.

Closes gh-20812

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/elasticsearch/ElasticsearchHealthIndicatorProperties.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.
@@ -47,20 +47,24 @@ public class ElasticsearchHealthIndicatorProperties {
 	 */
 	private Duration responseTimeout = Duration.ofMillis(100);
 
-	@DeprecatedConfigurationProperty(reason = "Upstream elasticsearch transport is deprected")
+	@DeprecatedConfigurationProperty(reason = "Upstream elasticsearch transport is deprecated.")
+	@Deprecated
 	public List<String> getIndices() {
 		return this.indices;
 	}
 
+	@Deprecated
 	public void setIndices(List<String> indices) {
 		this.indices = indices;
 	}
 
-	@DeprecatedConfigurationProperty(reason = "Upstream elasticsearch transport is deprected")
+	@DeprecatedConfigurationProperty(reason = "Upstream elasticsearch transport is deprecated.")
+	@Deprecated
 	public Duration getResponseTimeout() {
 		return this.responseTimeout;
 	}
 
+	@Deprecated
 	public void setResponseTimeout(Duration responseTimeout) {
 		this.responseTimeout = responseTimeout;
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitProperties.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.
@@ -275,8 +275,9 @@ public class RabbitProperties {
 		this.requestedHeartbeat = requestedHeartbeat;
 	}
 
-	@DeprecatedConfigurationProperty(reason = "replaced to support additional confirm types",
+	@DeprecatedConfigurationProperty(reason = "Replaced to support additional confirm types.",
 			replacement = "spring.rabbitmq.publisher-confirm-type")
+	@Deprecated
 	public boolean isPublisherConfirms() {
 		return ConfirmType.CORRELATED.equals(this.publisherConfirmType);
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/JacksonProperties.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.
@@ -126,6 +126,7 @@ public class JacksonProperties {
 		return this.jodaDateTimeFormat;
 	}
 
+	@Deprecated
 	public void setJodaDateTimeFormat(String jodaDataTimeFormat) {
 		this.jodaDateTimeFormat = jodaDataTimeFormat;
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java

@@ -138,12 +138,14 @@ public class ServerProperties {
 		this.address = address;
 	}
 
-	@DeprecatedConfigurationProperty(reason = "replaced to support additional strategies",
+	@DeprecatedConfigurationProperty(reason = "Replaced to support additional strategies.",
 			replacement = "server.forward-headers-strategy")
+	@Deprecated
 	public Boolean isUseForwardHeaders() {
 		return ForwardHeadersStrategy.NATIVE.equals(this.forwardHeadersStrategy);
 	}
 
+	@Deprecated
 	public void setUseForwardHeaders(Boolean useForwardHeaders) {
 		this.forwardHeadersStrategy = Boolean.TRUE.equals(useForwardHeaders) ? ForwardHeadersStrategy.NATIVE
 				: ForwardHeadersStrategy.NONE;