Importance of @document in Spring-data-mongodb (resolving MongoDB cannot be injected repository when coexisting with Redis)

Redis is used as a cache in the most recent project, and the database is MongoDB. Project uses spring and everything works without introducing Redis, but add in Pom.xml:

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId> Spring-boot-starter-redis</artifactid>
        </dependency>

When a dependency on Redis is introduced, no other action has been done at this time. Start the project will error, the error reason is unable to rely on injection MongoDB Repository. At this time in the domain of MongoDB add annotation @document can be resolved.