@Override
 public void messageReceived(final RecoveryFileChunkRequest request, TransportChannel channel)
     throws Exception {
   try (RecoveriesCollection.StatusRef statusRef =
       onGoingRecoveries.getStatusSafe(request.recoveryId(), request.shardId())) {
     final RecoveryStatus recoveryStatus = statusRef.status();
     final Store store = recoveryStatus.store();
     recoveryStatus.state().getTranslog().totalOperations(request.totalTranslogOps());
     final RecoveryState.Index indexState = recoveryStatus.state().getIndex();
     if (request.sourceThrottleTimeInNanos() != RecoveryState.Index.UNKNOWN) {
       indexState.addSourceThrottling(request.sourceThrottleTimeInNanos());
     }
     IndexOutput indexOutput;
     if (request.position() == 0) {
       indexOutput =
           recoveryStatus.openAndPutIndexOutput(request.name(), request.metadata(), store);
     } else {
       indexOutput = recoveryStatus.getOpenIndexOutput(request.name());
     }
     BytesReference content = request.content();
     if (!content.hasArray()) {
       content = content.toBytesArray();
     }
     RateLimiter rl = recoverySettings.rateLimiter();
     if (rl != null) {
       long bytes = bytesSinceLastPause.addAndGet(content.length());
       if (bytes > rl.getMinPauseCheckBytes()) {
         // Time to pause
         bytesSinceLastPause.addAndGet(-bytes);
         long throttleTimeInNanos = rl.pause(bytes);
         indexState.addTargetThrottling(throttleTimeInNanos);
         recoveryStatus.indexShard().recoveryStats().addThrottleTime(throttleTimeInNanos);
       }
     }
     indexOutput.writeBytes(content.array(), content.arrayOffset(), content.length());
     indexState.addRecoveredBytesToFile(request.name(), content.length());
     if (indexOutput.getFilePointer() >= request.length() || request.lastChunk()) {
       try {
         Store.verify(indexOutput);
       } finally {
         // we are done
         indexOutput.close();
       }
       // write the checksum
       recoveryStatus.legacyChecksums().add(request.metadata());
       final String temporaryFileName = recoveryStatus.getTempNameForFile(request.name());
       assert Arrays.asList(store.directory().listAll()).contains(temporaryFileName);
       store.directory().sync(Collections.singleton(temporaryFileName));
       IndexOutput remove = recoveryStatus.removeOpenIndexOutputs(request.name());
       assert remove == null || remove == indexOutput; // remove maybe null if we got finished
     }
   }
   channel.sendResponse(TransportResponse.Empty.INSTANCE);
 }