如何将ElasticSearch 7.0版本与Spring Boot集成？
我正在尝试使用最新版本的Elastic Search库，该库已在Maven仓库中提供。
<dependency> <groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>7.0.0</version>
</dependency>
但不确定如何在导入了6.5的Spring Boot中使用第七版。我的Maven依赖项：
<dependency> <groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
回答：
Spring Boot 2.3集成了spring-data-elasticsearch
4，因此将立即支持ElasticSearch7.x。它将很快发布，但是您已经可以尝试：
plugins { id 'org.springframework.boot' version '2.3.0.RC1'
id 'io.spring.dependency-management' version '1.0.9.RELEASE'
}
我已经对其进行了积极的测试，并且我所有的测试场景都通过了，所以我绝对会推荐这种方式。对于某些出于某些原因无法升级到2.3的人们，我将在下面保留答案。
（先前版本的原始答案）
我们真的不知道什么时候发布 Spring Data Elastic Search ，所以我发布了整合当前 Spring Data
Elastic Search 和稳定的 Spring Boot 。如果您想使用Spring
Repositories和最新的Elastic Search，它可能是您的临时解决方法。
1）在依赖项中强制使用最新的elasticsearch客户端（在我的情况下： ）
dependencies { //Force spring-data to use the newest elastic-search client
//this should removed as soon as spring-data-elasticsearch:4.0.0 is released!
implementation('org.springframework.data:spring-data-elasticsearch:4.0.0.BUILD-SNAPSHOT') {
exclude group: 'org.elasticsearch'
exclude group: 'org.elasticsearch.plugin'
exclude group: 'org.elasticsearch.client'
}
implementation('org.elasticsearch:elasticsearch:7.3.0') { force = true }
implementation('org.elasticsearch.client:elasticsearch-rest-high-level-client:7.3.0') { force = true }
implementation('org.elasticsearch.client:elasticsearch-rest-client:7.3.0') { force = true }
}
2）禁用elasticsearch自动配置和运行状况检查组件，因为它们变得不兼容（您稍后可能要实施自己的运行状况检查）。
@SpringBootApplication(exclude = {ElasticsearchAutoConfiguration.class, ElasticSearchRestHealthIndicatorAutoConfiguration.class})@EnableElasticsearchRepositories
public class SpringBootApp {
public static void main(String[] args) {
SpringApplication.run(SpringBootApp.class, args);
}
}
3）当我们禁用自动配置时，我们需要初始化ElasticsearchRestTemplate自己。我们还需要这样做以提供自定义，MappingElasticsearchConverter以避免类不兼容。
/** * Manual configuration to support the newest ElasticSearch that is currently not supported by {@link org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration}.
*
* @author aleksanderlech
*/
@Configuration
@EnableConfigurationProperties(ElasticsearchProperties.class)
public class ElasticSearchConfiguration {
@Primary
@Bean
public ElasticsearchRestTemplate elasticsearchTemplate(ElasticsearchProperties configuration) {
var nodes = Stream.of(configuration.getClusterNodes().split(",")).map(HttpHost::create).toArray(HttpHost[]::new);
var client = new RestHighLevelClient(RestClient.builder(nodes));
var converter = new CustomElasticSearchConverter(new SimpleElasticsearchMappingContext(), createConversionService());
return new ElasticsearchRestTemplate(client, converter, new DefaultResultMapper(converter));
}
private DefaultConversionService createConversionService() {
var conversionService = new DefaultConversionService();
conversionService.addConverter(new StringToLocalDateConverter());
return conversionService;
}
}
CustomElasticSearchConverter：
/** * Custom version of {@link MappingElasticsearchConverter} to support newest Spring Data Elasticsearch integration that supports ElasticSearch 7. Remove when Spring Data Elasticsearch 4.x is released.
*/
class CustomElasticSearchConverter extends MappingElasticsearchConverter {
private CustomConversions conversions = new ElasticsearchCustomConversions(Collections.emptyList());
CustomElasticSearchConverter(MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext) {
super(mappingContext);
setConversions(conversions);
}
CustomElasticSearchConverter(MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext, GenericConversionService conversionService) {
super(mappingContext, conversionService);
setConversions(conversions);
}
@Override
protected <R> R readValue(@Nullable Object source, ElasticsearchPersistentProperty property,
TypeInformation<R> targetType) {
if (source == null) {
return null;
}
if (source instanceof List) {
return readCollectionValue((List) source, property, targetType);
}
return super.readValue(source, property, targetType);
}
private Object readSimpleValue(@Nullable Object value, TypeInformation<?> targetType) {
Class<?> target = targetType.getType();
if (value == null || target == null || ClassUtils.isAssignableValue(target, value)) {
return value;
}
if (conversions.hasCustomReadTarget(value.getClass(), target)) {
return getConversionService().convert(value, target);
}
if (Enum.class.isAssignableFrom(target)) {
return Enum.valueOf((Class<Enum>) target, value.toString());
}
return getConversionService().convert(value, target);
}
private <R> R readCollectionValue(@Nullable List<?> source, ElasticsearchPersistentProperty property,
TypeInformation<R> targetType) {
if (source == null) {
return null;
}
Collection<Object> target = createCollectionForValue(targetType, source.size());
for (Object value : source) {
if (isSimpleType(value)) {
target.add(
readSimpleValue(value, targetType.getComponentType() != null ? targetType.getComponentType() : targetType));
} else {
if (value instanceof List) {
target.add(readValue(value, property, property.getTypeInformation().getActualType()));
} else {
target.add(readEntity(computeGenericValueTypeForRead(property, value), (Map) value));
}
}
}
return (R) target;
}
private Collection<Object> createCollectionForValue(TypeInformation<?> collectionTypeInformation, int size) {
Class<?> collectionType = collectionTypeInformation.isCollectionLike()//
? collectionTypeInformation.getType() //
: List.class;
TypeInformation<?> componentType = collectionTypeInformation.getComponentType() != null //
? collectionTypeInformation.getComponentType() //
: ClassTypeInformation.OBJECT;
return collectionTypeInformation.getType().isArray() //
? new ArrayList<>(size) //
: CollectionFactory.createCollection(collectionType, componentType.getType(), size);
}
private ElasticsearchPersistentEntity<?> computeGenericValueTypeForRead(ElasticsearchPersistentProperty property,
Object value) {
return ClassTypeInformation.OBJECT.equals(property.getTypeInformation().getActualType())
? getMappingContext().getRequiredPersistentEntity(value.getClass())
: getMappingContext().getRequiredPersistentEntity(property.getTypeInformation().getActualType());
}
private boolean isSimpleType(Object value) {
return isSimpleType(value.getClass());
}
private boolean isSimpleType(Class<?> type) {
return conversions.isSimpleType(type);
}
}
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