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Magento_Indexer module is a base of Magento Indexing functionality. It allows:

  • read indexers configuration,
  • represent indexers in admin,
  • regenerate indexes by cron schedule,
  • regenerate indexes from console,
  • view and reset indexer state from console,
  • view and set indexer mode from console

There are 2 modes of the Indexers: “Update on save” and “Update by schedule”. Manual full reindex can be performed via console by running php -f bin/magento indexer:reindex console command.