Fixed Index Management Select all

Author: minesh0111

app/code/Magento/Backend/Block/Widget/Grid/Massaction/Extended.php

@@ -274,7 +274,13 @@ public function getGridIdsJson()
 
         /** @var \Magento\Framework\Data\Collection $allIdsCollection */
         $allIdsCollection = clone $this->getParentBlock()->getCollection();
-        $massActionIdField = $this->getParentBlock()->getMassactionIdField();
+        
+        if($this->getMassactionIdField()) {
+            $massActionIdField = $this->getMassactionIdField();
+        }else {
+            $massActionIdField = $this->getParentBlock()->getMassactionIdField();
+        }
+        
         $gridIds = $allIdsCollection->setPageSize(0)->getColumnValues($massActionIdField);
 
         if (!empty($gridIds)) {