Solr Sentry plug-in integration with DB store

Currently Solr does support index-level security via sentry with file as backend privilege store. Using file as the backend store is simple, but there has some disadvantages as followings:
1. Can't satisfied with the needs of dynamically add, delete and update permissions
2. Can't be centrally managed and difficult to maintain
According to the above disadvantages, The Solr Sentry plug-in integration with DB store is demanded. The Hive Sentry plug-in has already integration with DB store, but the Hive authorization model is different from the Solr authorization model.So this new feature depends on the generic authorization model(SENTRY-398).