https://webiators.com/webiators-reindex-from-admin-extension/
Reindex From Admin Panel without SSH | Single Click Reindex
Reindex from Admin extension allows an admin to reindex the data of the website in a single click. Saves time and keeps your store up to date.
admin panelreindexwithoutssh
https://inchoo.net/magento-2/reindex-only-required-indexers-in-magento-2-from-cli/
Reindex only required indexers in Magento 2 from CLI - Inchoo.net
Jun 16, 2021 - Find out how to address the particular indexer(s) without any hassle of knowing which one caused the warning to appear in the Magento.
reindexrequiredindexerscli