更新
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。
OLD WORKAROUND （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 4.x ，所以我发布了整合当前 Spring Data
Elastic Search 4.x 和稳定的 Spring Boot 2.1.7的方式 。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： build.gradle ）
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})@EnableElasticsearchRepositoriespublic 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。
@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：
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); }}
