Upgrade to Spring Data 2021.0.0-M2

Closes gh-24931

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/elasticsearch/ElasticsearchDataConfiguration.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.
@@ -17,7 +17,6 @@
 package org.springframework.boot.autoconfigure.data.elasticsearch;
 
 import org.elasticsearch.action.support.IndicesOptions;
-import org.elasticsearch.action.support.WriteRequest;
 import org.elasticsearch.client.RestHighLevelClient;
 
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
@@ -30,6 +29,7 @@ import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
 import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
 import org.springframework.data.elasticsearch.core.ReactiveElasticsearchOperations;
 import org.springframework.data.elasticsearch.core.ReactiveElasticsearchTemplate;
+import org.springframework.data.elasticsearch.core.RefreshPolicy;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.mapping.SimpleElasticsearchMappingContext;
@@ -87,7 +87,7 @@ abstract class ElasticsearchDataConfiguration {
 				ElasticsearchConverter converter) {
 			ReactiveElasticsearchTemplate template = new ReactiveElasticsearchTemplate(client, converter);
 			template.setIndicesOptions(IndicesOptions.strictExpandOpenAndForbidClosed());
-			template.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE);
+			template.setRefreshPolicy(RefreshPolicy.IMMEDIATE);
 			return template;
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/rest/SpringBootRepositoryRestConfigurer.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.
@@ -43,12 +43,6 @@ class SpringBootRepositoryRestConfigurer implements RepositoryRestConfigurer {
 	@Autowired
 	private RepositoryRestProperties properties;
 
-	@Override
-	@SuppressWarnings("deprecation")
-	public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
-		configureRepositoryRestConfiguration(config, null);
-	}
-
 	@Override
 	public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config, CorsRegistry cors) {
 		this.properties.applyTo(config);

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -1552,7 +1552,7 @@ bom {
 			]
 		}
 	}
-	library("Spring Data Bom", "2020.0.2") {
+	library("Spring Data Bom", "2021.0.0-M2") {
 		group("org.springframework.data") {
 			imports = [
 				"spring-data-bom"