Aspire 5.0 compared to its predecessors Aspire 3.x and 4.x had a major architecture re-design, for the purpose of tackling the most common source of complexity in managing Aspire deployments: configuration, availability, coordination of crawl execution.
The biggest change you would noticed notice compared to prior versions is that there isn't a content-source anymore. The configuration of crawls have been split into re-usable entities with relationships to one another.
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