ConcurrentModificationException when using ImporterFilter on a GenericMultiThreadedImporter

In the replication import process the import-core module is used.This provides support for multi threads during the import process.The problems appear when an filter is defined for the multi thread importer,filter which is used to make modification on the enable status of filters.More exactly if the call to this importer is made from a listener,and in the multi thread importer, modifications are made on the enable status of existing filters,then a java.util.ConcurrentModificationException is generated.