Simplify exchange release logic (#128084)

Author: idegtiarenko

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/plugin/DataNodeComputeHandler.java

@@ -248,9 +248,6 @@ private class DataNodeRequestExecutor {
         }
 
         void start() {
-            parentTask.addListener(
-                () -> exchangeService.finishSinkHandler(request.sessionId(), new TaskCancelledException(parentTask.getReasonCancelled()))
-            );
             runBatch(0);
         }
 
@@ -419,7 +416,12 @@ private void runComputeOnDataNode(
             var parentListener = computeListener.acquireAvoid();
             try {
                 // run compute with target shards
+                var externalSink = exchangeService.getSinkHandler(externalId);
                 var internalSink = exchangeService.createSinkHandler(request.sessionId(), request.pragmas().exchangeBufferSize());
+                task.addListener(() -> {
+                    exchangeService.finishSinkHandler(externalId, new TaskCancelledException(task.getReasonCancelled()));
+                    exchangeService.finishSinkHandler(request.sessionId(), new TaskCancelledException(task.getReasonCancelled()));
+                });
                 DataNodeRequestExecutor dataNodeRequestExecutor = new DataNodeRequestExecutor(
                     request,
                     task,
@@ -431,10 +433,6 @@ private void runComputeOnDataNode(
                 );
                 dataNodeRequestExecutor.start();
                 // run the node-level reduction
-                var externalSink = exchangeService.getSinkHandler(externalId);
-                task.addListener(
-                    () -> exchangeService.finishSinkHandler(externalId, new TaskCancelledException(task.getReasonCancelled()))
-                );
                 var exchangeSource = new ExchangeSourceHandler(1, esqlExecutor);
                 exchangeSource.addRemoteSink(internalSink::fetchPageAsync, true, () -> {}, 1, ActionListener.noop());
                 var reductionListener = computeListener.acquireCompute();