Spring Data ElasticSearch：同一文档的多个索引

Question

我使用的是spring-data-elasticsearch，一开始一切都很好。

@Document( type = "products", indexName = "empty" )
public class Product
{
...
}

public interface ProductRepository extends ElasticsearchRepository<Product, String>
{
...
}

@Autowired
private ProductRepository repository;
...
repository.findByIdentifier( "xxx" ).getCategory() );

ProductRepository customerRepo = ElasticsearchPool.getRepoByCustomer("abc", ProductRepository.class);
repository.findByIdentifier( "xxx" ).getCategory();

是否可以在运行时使用不同的索引创建存储库？

多谢了，马塞尔

Answer 1

是的。Spring有可能。但是您应该使用ElasticsearchTemplate而不是repository。

例如。我有两种产品。它们存储在不同的索引中。

@Document(indexName = "product-a", type = "product")
public class ProductA {

    @Id
    private String id;

    private String name;

    private int value;

    //Getters and setters
}

@Document(indexName = "product-b", type = "product")
public class ProductB {

    @Id
    private String id;

    private String name;

    //Getters and setters

}

假设如果它们具有相同的类型，那么它们具有相同的字段。但没必要。两个产品可以有完全不同的字段。

public interface ProductARepository extends ElasticsearchRepository<ProductA, String> {
}


public interface ProductBRepository
    extends ElasticsearchRepository<ProductB, String> {


}

@Repository
public class CustomProductRepositoryImpl {

    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;

    public List<ProductA> findProductByName(String name) {
        MatchQueryBuilder queryBuilder = QueryBuilders.matchPhrasePrefixQuery("name", name);

        //You can query as many indices as you want
        IndicesQueryBuilder builder = QueryBuilders.indicesQuery(queryBuilder, "product-a", "product-b");

        SearchQuery searchQuery = new NativeSearchQueryBuilder().withQuery(builder).build();

        return elasticsearchTemplate.query(searchQuery, response -> {
            SearchHits hits = response.getHits();
            List<ProductA> result = new ArrayList<>();
            Arrays.stream(hits.getHits()).forEach(h -> {
                Map<String, Object> source = h.getSource();
                //get only id just for test
                ProductA productA = new ProductA()
                        .setId(String.valueOf(source.getOrDefault("id", null)));
                result.add(productA);
            });
            return result;
        });
    }

}

您可以搜索任意多个索引，并且可以透明地将此行为注入到ProductARepository中，将自定义行为添加到单个存储库中

第二个解决方案是使用索引别名，但您还必须创建自定义模型或自定义存储库。