Logging: change logging to warning in LocalAllocateDangledIndices

Closes #9593

src/main/java/org/elasticsearch/gateway/LocalAllocateDangledIndices.java

@@ -159,7 +159,7 @@ public class LocalAllocateDangledIndices extends AbstractComponent {
                     try {
                         channel.sendResponse(t);
                     } catch (Exception e) {
-                        logger.error("failed send response for allocating dangled", e);
+                        logger.warn("failed send response for allocating dangled", e);
                     }
                 }
 
@@ -168,7 +168,7 @@ public class LocalAllocateDangledIndices extends AbstractComponent {
                     try {
                         channel.sendResponse(new AllocateDangledResponse(true));
                     } catch (IOException e) {
-                        logger.error("failed send response for allocating dangled", e);
+                        logger.warn("failed send response for allocating dangled", e);
                     }
                 }
             });