Deprecate ConfigurationProperties#location

Closes gh-5129

spring-boot/src/main/java/org/springframework/boot/context/properties/ConfigurationProperties.java

@@ -90,7 +90,9 @@ public @interface ConfigurationProperties {
 	 * defined in the environment.
 	 * @return the path (or paths) of resources to bind to
 	 * @see #merge()
+	 * @deprecated configure the environment with those additional locations instead
 	 */
+	@Deprecated
 	String[] locations() default {};
 
 	/**
@@ -98,7 +100,9 @@ public @interface ConfigurationProperties {
 	 * merged with the default configuration.
 	 * @return the flag value (default true)
 	 * @see #locations()
+	 * @deprecated as {@link #locations()} is deprecated as well
 	 */
+	@Deprecated
 	boolean merge() default true;
 
 }

spring-boot/src/main/java/org/springframework/boot/context/properties/ConfigurationPropertiesBindingPostProcessor.java

@@ -302,6 +302,7 @@ public class ConfigurationPropertiesBindingPostProcessor
 		return bean;
 	}
 
+	@SuppressWarnings("deprecation")
 	private void postProcessBeforeInitialization(Object bean, String beanName,
 			ConfigurationProperties annotation) {
 		Object target = bean;