Clear CommandCursorResult.results after next()/tryNext().

driver-core/src/main/com/mongodb/internal/operation/CommandBatchCursor.java

@@ -144,6 +144,7 @@ private List<T> doNext() {
 
         List<T> retVal = nextBatch;
         nextBatch = null;
+        commandCursorResult = CommandCursorResult.withEmptyResults(commandCursorResult);
         return retVal;
     }
 

driver-core/src/main/com/mongodb/internal/operation/CommandCursorResult.java

@@ -23,6 +23,7 @@
 import org.bson.BsonDocument;
 import org.bson.BsonTimestamp;
 
+import java.util.Collections;
 import java.util.List;
 
 import static com.mongodb.assertions.Assertions.isTrue;
@@ -60,6 +61,31 @@ public CommandCursorResult(
         this.postBatchResumeToken = cursorDocument.getDocument(POST_BATCH_RESUME_TOKEN, null);
     }
 
+    private CommandCursorResult(
+            final ServerAddress serverAddress,
+            final List<T> results,
+            final MongoNamespace namespace,
+            final long cursorId,
+            @Nullable final BsonTimestamp operationTime,
+            @Nullable final BsonDocument postBatchResumeToken) {
+        this.serverAddress = serverAddress;
+        this.results = results;
+        this.namespace = namespace;
+        this.cursorId = cursorId;
+        this.operationTime = operationTime;
+        this.postBatchResumeToken = postBatchResumeToken;
+    }
+
+    public static <T> CommandCursorResult<T> withEmptyResults(final CommandCursorResult<T> commandCursorResult) {
+        return new CommandCursorResult<>(
+                commandCursorResult.getServerAddress(),
+                Collections.emptyList(),
+                commandCursorResult.getNamespace(),
+                commandCursorResult.getCursorId(),
+                commandCursorResult.getOperationTime(),
+                commandCursorResult.getPostBatchResumeToken());
+    }
+
     /**
      * Gets the namespace.
      *