How to Reindex Magento 2 from SSH/CLI or Admin Panel?

1. Go to System > Index Management and check indexers status.
2. Select the items that are marked as “Reindex required” and go to Actions > Update on schedule

Run this command for all indexing

php bin/magento index:reindex

Check the status of the indexe and identify indexe that still need to be individually reindexed, sometimes general reindex does not work for all indexers

php bin/magento indexe:status

You will receive a similar result as presented below:

Show the list of the indexe and corresponding indexer id that need to be used for individual reindex.

php bin/magento index:info

Check again the status of the indexers using the command from step 2, now all indexers should be “Ready”.

php bin/magento index:status

Source: https://support.weltpixel.com/hc/en-us/articles/115000355673-How-to-reindex-your-Magento-2-store-from-admin-or-SSH-CLI