Mikael Svenson wrote a cool script which will iterate all site collections, sites and sub-sites on your tenant to force a trigger of re-indexing / full crawl of all items on the next crawl.
In SharePoint Online we cannot force a full crawl via the admin user interface and thus have to iterate all sites and set a property in the property bag to accomplish the same task:
function processWeb($web) {
$subWebs = $web.Webs
$clientContext.Load($web)
$clientContext.Load($web.AllProperties)
$clientContext.Load($subWebs)
$clientContext.ExecuteQuery()
Write-Host "Web URL:" $web.Url -ForegroundColor White
if( $enableAllManagedProperties -ne "skip" ) {
Set-AllManagedProperties -web $web -clientContext $clientContext -enableAllManagedProps $enableAllManagedProperties
}
[int]$version = 0
$allProperties = $web.AllProperties
if( $allProperties.FieldValues.ContainsKey("vti_searchversion") -eq $true ) {
$version = $allProperties["vti_searchversion"]
}
$version++
$allProperties["vti_searchversion"] = $version
Write-Host "-- Updated search version: " $version -ForegroundColor Green
$web.Update()
$clientContext.ExecuteQuery()
foreach ($subWeb in $subWebs)
{
processWeb($subWeb)
}
}
This is needed for several search schema modifications, for example when you map crawled properties to managed properties.
The script also has a function to enable population of the ManagedProperties managed property for use with the SharePoint 2013 Search Query Tool v2.
You can download the script here: https://github.com/wobba/SPO-Trigger-Reindex
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