code: public void syncDocumentsFromRemote(
        final MongoNamespace namespace,
        final BsonValue... documentIds
    ) {
      this.waitUntilInitialized();
  
      try {
        ongoingOperationsGroup.enter();
  
        if (syncConfig.addSynchronizedDocuments(namespace, documentIds)) {
          checkAndInsertNamespaceListener(namespace);
        }
      } finally {
        ongoingOperationsGroup.exit();
      }
    }
docs: Requests that a document be synchronized by the given _id. Actual synchronization of the
  document will happen later in a {@link DataSynchronizer#doSyncPass()} iteration.
  
  @param namespace  the namespace to put the document in.
  @param documentIds the _ids of the documents.