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How To Re Crawl or Index A SharePoint Site on O365

Re-index a site

WARNING:  Re-indexing a site can cause a massive load on the search system. Don’t re-index your site unless you’ve made changes that require all items to be re-indexed.

  1. On the site, click Settings > Site Settings.
  2. Under Search, click Search and offline availability.
  3. In the Reindex site section, click Reindex site.
  4. A warning appears, click Reindex site again to confirm. The content will be re-indexed during the next scheduled crawl.

Re-index a document library or a list

  1. On the site, go to the list or library that you want to re-index.

  2. In the ribbon, click the Library tab or the List tab.

  3. In the Library ribbon, choose Library Settings,
    or,

In the List ribbon choose List Settings.

  1. On the Settings page, under General Settings, choose Advanced settings.

  2. Scroll down to Reindex Document Library or Reindex List, and click the button. The content will be re-indexed during the next scheduled crawl.

 

References: https://support.office.com/en-us/article/Manually-request-crawling-and-re-indexing-of-a-site-a-library-or-a-list-9afa977d-39de-4321-b4ca-8c7c7e6d264e