Run this below query on magento 2 database.
update indexer_state set status = 'invalid' where indexer_id = 'indexer_id_name'; //Replace indexer_id_name with stuck indexer. for example:- update indexer_state set status = 'invalid' where indexer_id = 'customer_order_history';And again run the indexer command.
php bin/magento indexer:reindex
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