Upgrade-Site

SharePoint Online: Starts the upgrade process on a site collection

Script

#Requires -Version 5.1
#Requires -Modules Microsoft.Online.SharePoint.PowerShell

[CmdletBinding()]
Param(
    [Parameter(Mandatory = $true)]
    [string]$Identity,
    [switch]$NoEmail,
    [switch]$QueueOnly,
    [switch]$VersionUpgrade
)

Process {
    try {
        $cmdArgs = @{ ErrorAction = 'Stop'; Identity = $Identity; NoEmail = $NoEmail; QueueOnly = $QueueOnly; VersionUpgrade = $VersionUpgrade; Confirm = $false }
        $result = Upgrade-SPOSite @cmdArgs | Select-Object *
        if ($null -ne $result) { foreach ($item in $result) { $item | Add-Member -NotePropertyName Timestamp -NotePropertyValue (Get-Date -Format "yyyy-MM-dd HH:mm:ss") -PassThru -Force } }
    }
    catch { throw }
}

Customize

Identity string

URL of the site collection to upgrade

NoEmail switch

Off

Do not send notification email upon completion

QueueOnly switch

Off

Add to upgrade queue without immediate execution

VersionUpgrade switch

Off

Perform a version-to-version upgrade