How to force a full Reindex in SharePoint with PowerShell

In SharePoint , you may want to trigger a complete re-indexing of your site. This manipulation is possible with the site administration.

You can do the same thing with PowerShell by changing the value of the web property vti_searchversion

Below is a PowerShell function that re-index the entire site collection, it will update the vti_searchversion value, which will trigger a complete site collection re- indexing that will be considered in the next crawling.

function ReindexSite{

      param($web)

      Write-Host -ForegroundColor Yellow " Reindexing Site : " $ web.Title

      [int] $version = 0

      $propertyBag = $ web.AllProperties

      if ($propertyBag.ContainsKey("vti_searchversion") -eq $true)

      {

            $version = $propertyBag["vti_searchversion"]

      }

      Write-Host "Current search version: " $version -ForegroundColor Yellow

      $version++

      $propertyBag ["vti_searchversion"] = $version

      Write-Host "Updated search version: " $version -ForegroundColor Green

      $web.Update()

      foreach ($subWeb in $ web.Webs)

      {

            ReindexSite($subWeb)

      }

}

You can do also the same thing in SharePoint Online with this script:

function ReindexSite{

       param($web)

       $subWebs = $web.Webs

       $clientContext.Load($web)

       $propertyBag = $ web.AllProperties

       $allProperties = $web.AllProperties

       $clientContext.Load($propertyBag)

       $clientContext.Load($subWebs)

       $clientContext.ExecuteQuery()

       Write-Host -ForegroundColor Yellow " Reindexing Site : " $ web.Title

       [int] $version = 0

       $propertyBag = $ rootWeb.AllProperties

       if ($propertyBag.FieldValues.ContainsKey("vti_searchversion") -eq $true)

       {

             $version = $propertyBag["vti_searchversion"]

       }

       Write-Host "Current search version: " $version -ForegroundColor Yellow

       $version++

       $propertyBag["vti_searchversion"] = $version

       Write-Host "Updated search version: " $version -ForegroundColor Green

       $web.Update()

$clientContext.ExecuteQuery()

       foreach ($subWeb in $subWebs)

       {

             ReindexSite($subWeb)

       }

}