Managing caching
Modifying the solrconfig.xml file to use the StandardDirectoryFactory.
The DSENRTCachingDirectoryFactory is deprecated. If you use
DSENRTCachingDirectoryFactory or the NRTCachingDirectoryFactory, modify the
solrconfig.xml to use the StandardDirectoryFactory. For example,
change the directoryFactory element in the solrconfig.xml
file as follows: <directoryFactory
class="solr.StandardDirectoryFactory"
name="DirectoryFactory"/>