Temporarily work around breaking API change in Spring Data Couchbase

See gh-25002

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/couchbase/CouchbaseDataConfiguration.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.
@@ -72,7 +72,6 @@ class CouchbaseDataConfiguration {
 			mappingContext
 					.setFieldNamingStrategy((FieldNamingStrategy) BeanUtils.instantiateClass(fieldNamingStrategy));
 		}
-		mappingContext.setAutoIndexCreation(properties.isAutoIndex());
 		return mappingContext;
 	}