All possible values are described within the property files. The files are listed by their corresponding OSGi bundle:

com.openexchange.mail.smal.impl:
- smal.properties

com.openexchange.service.indexing.impl:
- indexing-service.properties

com.openexchange.index (contained in open-xchange-core):
- index.properties
- index.yml

com.openexchange.solr:
- solr.properties