How to fix “One or more indexers are invalid” in Magento 2

After you install Magento 2, you will see “One or more indexers are invalid. Make sure your Magento cron job is running” on the Magento 2 backend. In fact, it’s only a reindex problem, which Magento 1 is very easily to reindex on backend but we could use Magento CLI to reindex for Magento 2.

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