Remove @Persistent from MongoDB entity scanning

This commit removes `org.springframework.data.annotation.Persistent`
from the annotation types used for MongoDB entity scanning to align
with Spring Data MongoDB.

Fixes gh-25797

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/mongo/MongoDataConfiguration.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -26,7 +26,6 @@ import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.data.annotation.Persistent;
 import org.springframework.data.mapping.model.FieldNamingStrategy;
 import org.springframework.data.mongodb.core.convert.MongoCustomConversions;
 import org.springframework.data.mongodb.core.mapping.Document;
@@ -37,6 +36,7 @@ import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
  *
  * @author Madhura Bhave
  * @author Artsiom Yudovin
+ * @author Scott Fredericks
  */
 @Configuration(proxyBeanMethods = false)
 class MongoDataConfiguration {
@@ -48,7 +48,7 @@ class MongoDataConfiguration {
 		PropertyMapper mapper = PropertyMapper.get().alwaysApplyingWhenNonNull();
 		MongoMappingContext context = new MongoMappingContext();
 		mapper.from(properties.isAutoIndexCreation()).to(context::setAutoIndexCreation);
-		context.setInitialEntitySet(new EntityScanner(applicationContext).scan(Document.class, Persistent.class));
+		context.setInitialEntitySet(new EntityScanner(applicationContext).scan(Document.class));
 		Class<?> strategyClass = properties.getFieldNamingStrategy();
 		if (strategyClass != null) {
 			context.setFieldNamingStrategy((FieldNamingStrategy) BeanUtils.instantiateClass(strategyClass));

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/mongo/city/PersistentEntity.java

+/*
+ * Copyright 2012-2021 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
+ *
+ *      https://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,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.data.mongo.city;
+
+import java.io.Serializable;
+
+import org.springframework.data.annotation.Persistent;
+
+@Persistent
+public class PersistentEntity implements Serializable {
+
+	private static final long serialVersionUID = 1L;
+
+}