this.iwBytesUsed = iwBytesUsed;
hash = new BytesRefHash(
new ByteBlockPool(
new ByteBlockPool.DirectTrackingAllocator(iwBytesUsed)),
BytesRefHash.DEFAULT_CAPACITY,
new DirectBytesStartArray(BytesRefHash.DEFAULT_CAPACITY, iwBytesUsed));
pending = new AppendingPackedLongBuffer(PackedInts.COMPACT);
pendingCounts = new AppendingDeltaPackedLongBuffer(PackedInts.COMPACT);
bytesUsed = pending.ramBytesUsed() + pendingCounts.ramBytesUsed();
iwBytesUsed.addAndGet(bytesUsed);
}