For more details see how the Reindex from Admin extension works.
Easily reindex data right from the admin panel. The extension allows you to avoid cart abandonment and lagging.
To configure the extension, please go to System → Index Management.
On a handy grid you can see all necessary information in one place:
Indexer - the name of the object that creates an index. Magento accumulates data into special tables using these indexers.
Description - here the type and the operations of reindex performed are specified.
Mode - active mode of the indexer. Update on Save - updates index data immediately after the changes.
Status - see the live status of the indexation: Reindex Required, Processing or Ready.
Updated - check the date of the latest reindexation.
To reindex data, choose the indexers you need and tick them. In the Actions dropdown menu choose the action Reindex.
Then click the Submit button.
To reindex all data in bulk, hit the Reindex All button.
Please wait for a while and reload the page to check the result in the 'status' column.
Sometimes a few indexes can get stuck. To fix that, you need to run the php bin/magento indexer:reset command. There is also an easier way.
Simply click on the Reset button on the grid to fix a specific index. Then, it will be reindexed.