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You choose to re-index your domain/s or collection manually through the Domains Crawler section in your Consolein the Console via the “Re-crawl all pages” button on the crawl statuses subpage.
Keep in mind that you may not need to re-index your entire site to add new pages or update content in your search index. You can add individual pages to the index through the Domains section in the diagnose tool in the Crawler crawl statuses page in the Console, or have the new content instantly indexed by installing our ping-back code.