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Important: Resetting crawled content has serious implications. It deletes the content index and the property store. After a reset, search results will not be available until after crawls are run.
On the Search Administration page, under Crawling, click Reset all crawled content.
On the Reset Crawled Content page, the Deactivate search alerts during reset check box is selected by default. This option prevents users who have search alerts configured from being sent unnecessary e-mail due to the crawled content reset. Clear this check box if you do not want to disable alerts during the reset.
Click Reset Now.
In the message box confirming that you want to reset the search content index, click OK.