While re indexing got an error:

PHP Fatal error: Uncaught Error: Call to undefined method Magento\Customer\Model\Indexer\Source::addAttributeToSelect() in /var/www/html/ncsmokehouse/vendor/magento/framework/Indexer/Handler/AttributeHandler.php:38


Add a function :

public function addAttributeToSelect($fieldName, $alias = null)
       $this->customerCollection->addAttributeToSelect($fieldName, $alias);
       return $this;

in this file /www/vendor/magento/module-customer/Model/Indexer/Source.php

you can override this file because we can't change in core module. it's working


In my case, it works. However, after that, I've found another reindex issue, which I've solved by following this Magento 2 How to Unlock Reindex Process: Index is locked by another reindex process Skipping

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