The following properties are available as implicit properties for the Solr core:

• solr.core.config
• solr.core.dataDir
• solr.core.loadOnStartup
• solr.core.name
• solr.core.schema
• solr.core.transient

Since implicitly we do not need to specify them in core.properties, but they are implicitly available to be used in solrconfig.xml.