CMIS store has been officially deprecated because it has performance issues with large repos.
Since that, it could be useful to customers and developers have a mechanism in the code to know that:
- deprecation of the class
- remove the reference to configure it in portal.properties
- a warn during startup
This has been added to documentation (see https://dev.liferay.com/discover/portal/-/knowledge_base/7-0/liferay-repository-types#using-the-cmis-store)