DATACMNS-977 - Added @Indexed to core annotations and types to be indexed for component scanning.

Equipped @Persistent, @RepositoryDefinition and our Repository marker interface with @Indexed so that Spring 5's annotation processor will detect types annotated with or extending the aforementioned type for inclusion in the component index.

Related ticket: SPR-11890.

src/main/java/org/springframework/data/annotation/Persistent.java

@@ -1,11 +1,11 @@
 /*
- * Copyright (c) 2011 by the original author(s).
+ * Copyright 2011-2017 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.
  * You may obtain a copy of the License at
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
@@ -13,7 +13,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package org.springframework.data.annotation;
 
 import java.lang.annotation.ElementType;
@@ -21,10 +20,16 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.stereotype.Indexed;
+
 /**
- * @author J. Brisbin <jbrisbin@vmware.com>
+ * Annotation to generally identify persistent types, fields and parameters.
+ * 
+ * @author Jon Brisbin
+ * @author Oliver Gierke
  */
+@Indexed
 @Retention(RetentionPolicy.RUNTIME)
-@Target(value = { ElementType.TYPE, ElementType.ANNOTATION_TYPE, ElementType.FIELD, ElementType.PARAMETER })
+@Target(value = { ElementType.TYPE, ElementType.FIELD, ElementType.PARAMETER })
 public @interface Persistent {
 }