Replace Deflector with IndexSetRegistry (#3073)

* Replace Deflector with IndexSetRegistry

* Simplify signature of IndexHelper#getOldestIndices()

* Reload StreamRouterEngine on creation/deletion of index set

* Rename MongoIndexSet#calculateRange() to setIndexReadOnlyAndCalculateRange()

* Add unknown index range for new indices

* Improve logging messages during deflector cycling

* Properly throw exception if index creation failed

graylog2-server/src/main/java/org/graylog2/bindings/PeriodicalBindings.java

@@ -27,6 +27,7 @@
 import org.graylog2.periodical.ClusterIdGeneratorPeriodical;
 import org.graylog2.periodical.ConfigurationManagementPeriodical;
 import org.graylog2.periodical.ContentPackLoaderPeriodical;
+import org.graylog2.periodical.DefaultIndexSetMigrationPeriodical;
 import org.graylog2.periodical.DefaultStreamMigrationPeriodical;
 import org.graylog2.periodical.EmailAlarmCallbackMigrationPeriodical;
 import org.graylog2.periodical.GarbageCollectionWarningThread;
@@ -69,6 +70,7 @@ protected void configure() {
         periodicalBinder.addBinding().to(LdapGroupMappingMigration.class);
         periodicalBinder.addBinding().to(IndexFailuresPeriodical.class);
         periodicalBinder.addBinding().to(DefaultStreamMigrationPeriodical.class);
+        periodicalBinder.addBinding().to(DefaultIndexSetMigrationPeriodical.class);
         periodicalBinder.addBinding().to(EmailAlarmCallbackMigrationPeriodical.class);
     }
 }