how to migrate search query from ElasticsearchRepository to ElasticsearchOperations

Question

My repository class uses the queries by using the standard method name findByxxx. It also has custom query using NativeSearchQueryBuilder.

Since search() methods have been removed from ElasticsearchRepository, I will create corresponding class to use ElasticsearchOperations. My code is like below.

    @Repository
    public interface BookRepository extends ElasticsearchRepository<Book, String> {
    
         public Optional<Book> findById(String bookId);

        //default public Page<Book> fetchBooksForUser(String userId, Pageable pageable) {...}
    }
    
    @Service
    public class BookOperation{   //new class
    
        @Autowired
        private ElasticsearchOperations elasticsearchOperations;
    
        public Page<Book> fetchBooksForUser(String userId, Pageable pageable) {..use elasticsearchOperations...}
    }
    
    @Service
    public class BookServiceImpl implements BookService {
    
        @Autowired
        private BookRepository bookRepository;
    
        @Autowired
        private BookOperation bookOperation;
    
        //some methods use bookRepository, some methods use formsPackageOperation
    }

I have more than 20 Repository classes. I don't want to repeat this 20 times. Is there a better to do this?

Answer 1

You just need to create a repository fragment, check tyhe documentation at https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#repositories.custom-implementations.

In the interface you define the method you need and in the Impl file you implement the necessary logic - you can just inject an ElasticsearchOperations into the implementations class.

As for the changes in your existing repositories: You just need to add your custom interface to the implements clause.