Part of the indexing configuration in Sitecore includes indexing strategies that you select from. These are C# classes that run at indexing time based on how you want the system to behave. The default strategy in a stock instance for the “web” database is onPublishEndAsync. This strategy uses the event queue to subscribe to the publish:end event. When raised, it triggers an incremental index update (i.e. not a full index rebuild but small deltas directly on the index).
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