Use pattern matching instead of type casting

[junghoon-vans]

JEP 394: Pattern Matching for instanceof allows to avoid direct typecasting.

Example

AS-IS

if (owner instanceof ElasticsearchPersistentEntity) {
 	return ((ElasticsearchPersistentEntity<?>) owner).getFieldNamingStrategy();
 }

TO-BE

if (owner instanceof ElasticsearchPersistentEntity<?> persistentEntity) {
 	return persistentEntity.getFieldNamingStrategy();
 }