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@evan A retrospective search compares a query to one or more documents that have been previously indexed. Such a query tells you what has been indexed in the past. Because the query looks to the past, it is "retrospective." You can process that query in "real-time," like Google, etc. do, or you can queue the query for processing once or more times in the future, but the query will always be looking to the past. Most "real-time" searches are implemented as repeated retrospective searches.
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