Migration to Magento 2.0.x : Why are the customers not displaying in the backend?

After a successful migration to Magento 2.0, the customer list is not visible in the backend, even after running the command: php ./bin/magento indexer:reindex successfully.
executed and the customers do reside in the database (customer_entity).

You can solve this by running the following sql in your database :

update indexer_state set status='invalid' where status ='working'

and after this again the command :

php ./bin/magento indexer:reindex