assertNotNull(nodes);
System.err.printf("Added %,d nodes to %s index in %s. Traversing...\n", count, index
.getClass().getSimpleName(), sw.stop());
MemoryUsage indexCreateMem = MEMORY_MX_BEAN.getHeapMemoryUsage();
sw.reset().start();
int size = Iterators.size(nodes);
System.err.printf("Traversed %,d nodes in %s\n", size, sw.stop());
MemoryUsage indexTraversedMem = MEMORY_MX_BEAN.getHeapMemoryUsage();
final double mbFactor = 1024 * 1024;
System.err