do not erase prior shard failures on skipping node

Author: idegtiarenko

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

@@ -113,7 +113,7 @@ protected void sendRequest(
                 NodeListener nodeListener
             ) {
                 if (exchangeSource.isFinished()) {
-                    nodeListener.onResponse(new DataNodeComputeResponse(List.of(), Map.of()));
+                    nodeListener.onSkip();
                     return;
                 }
 

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

@@ -199,6 +199,11 @@ public void onFailure(Exception e, boolean receivedData) {
                 }
                 onAfter(List.of());
             }
+
+            @Override
+            public void onSkip() {
+                onAfter(List.of());
+            }
         });
     }
 
@@ -208,6 +213,8 @@ interface NodeListener {
         void onResponse(DataNodeComputeResponse response);
 
         void onFailure(Exception e, boolean receivedData);
+
+        void onSkip();
     }
 
     private static Exception unwrapFailure(Exception e) {