crossdc-producer/src/main/java/org/apache/solr/update/processor/MirroringUpdateProcessor.java (4 lines):
	- line 179: // TODO: implement "expand without deep paging"
	- line 236: // TODO: Can we actually support this considering DBQs aren't versioned.
	- line 281: // TODO: what if this core is not in the targeted collection?
	- line 301: // TODO: We can't/shouldn't support this ?


crossdc-consumer/src/main/java/org/apache/solr/crossdc/messageprocessor/SolrMessageProcessor.java (2 lines):
	- line 73: // preventCircularMirroring(mirroredSolrRequest); TODO: isn't this handled by the mirroring handler?
	- line 95: // TODO: isn't this handled by the mirroring handler?


crossdc-commons/src/main/java/org/apache/solr/crossdc/common/MirroredSolrRequestSerializer.java (2 lines):
	- line 96: updateRequest.add("id", "1"); // TODO huh?
	- line 156: // TODO: add checks


crossdc-consumer/src/main/java/org/apache/solr/crossdc/consumer/KafkaCrossDcConsumer.java (2 lines):
	- line 330: if (e instanceof ClassCastException || e instanceof SerializationException) { // TODO: optional
	- line 351: if (e instanceof ClassCastException || e instanceof SerializationException) { // TODO: optional


crossdc-producer/src/main/java/org/apache/solr/update/processor/KafkaRequestMirroringHandler.java (1 line):
	- line 50: // TODO: Enforce external version constraint for consistent update replication (cross-cluster)


encryption/src/main/java/org/apache/solr/encryption/EncryptionDirectoryFactory.java (1 line):
	- line 52: // TODO: Ideally EncryptionDirectoryFactory would extend a DelegatingDirectoryFactory to delegate