概述SpringBoot摒弃了繁琐的xml配置的同时，提供了几种注册组件：ServletRegistrationBean，FilterRegistrationBean，ServletListenerRegistrationBean，DelegatingFilterProxyRegistrationBean，用于注册自对...

pom加入elasticsearch7 的依赖，<dependency><groupId>org.elasticsearch</groupId><artifactId>elasticsearch</artifactId><version>...