How to do a full site collecion level re-index in sharepoint online? - sharepoint

Question

After adding a new managed property I need to do a full site collection level or tenant level re-indexing to get the search crawler run. But I could not find a way to do this in SharePoint online.Is there a way to do this?

Answer 1

There is a script to re-index a SharePoint online site collection via CSOM. I think this will help you to re-index your 100+ subsites.
#Grab the tenant information
$username = Read-Host "Enter the tenant admin account login"
$password = Read-host -AsSecureString "Enter the admin account password"
$siteUrl = Read-Host "Please enter the site collection URL to re-index"
Write-Host "Would you like to populate the managed properties on all lists post re-crawl (ex. Cross Site Publishing)?" -ForegroundColor Green
Write-Host "1. Yes - enable managed properties on all lists in this site!" -ForegroundColor Cyan
Write-Host "2. No - Turn off managed properties in all lists in the site!" -ForegroundColor Blue
Write-Host "3. No - Just re-index the site!" -ForegroundColor Red
$enableAllManagedProperties = Read-Host "Choice [1-3]?"
$date = (Get-Date).ToString("yyyyMMdd")
#Load the assemblies
$load1 = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client")
$load2 = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.Runtime")
$load3 = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.UserProfiles")
if (!$load1) {
$script_folder = (Split-Path -Parent $MyInvocation.MyCommand.Path)
$load1 = [System.Reflection.Assembly]::LoadFile($script_folder + "\Microsoft.SharePoint.Client.dll")
if (!$load1) {
Write-Host "Failed to load Microsoft.SharePoint.Client.dll - please ensure it is in the same location as the PS1." -ForegroundColor Red
write-host "Alternatively, install the SPO Client Components SDK from http://www.microsoft.com/en-us/download/details.aspx?id=42038" -ForegroundColor Red
exit;
}
}
if (!$load2) {
$script_folder = (Split-Path -Parent $MyInvocation.MyCommand.Path)
$load2 = [System.Reflection.Assembly]::LoadFile($script_folder + "\Microsoft.SharePoint.Client.Runtime.dll")
if (!$load2) {
Write-Host "Failed to load Microsoft.SharePoint.Client.Runtime.dll - please ensure it is in the same location as the PS1." -ForegroundColor Red
write-host "Alternatively, install the SPO Client Components SDK from http://www.microsoft.com/en-us/download/details.aspx?id=42038" -ForegroundColor Red
exit;
}
}
if (!$load3) {
$script_folder = (Split-Path -Parent $MyInvocation.MyCommand.Path)
$load3 = [System.Reflection.Assembly]::LoadFile($script_folder + "\Microsoft.SharePoint.Client.UserProfiles.dll")
if (!$load3) {
Write-Host "Failed to load Microsoft.SharePoint.Client.UserProfiles.dll - please ensure it is in the same location as the PS1." -ForegroundColor Red
write-host "Alternatively, install the SPO Client Components SDK from http://www.microsoft.com/en-us/download/details.aspx?id=42038" -ForegroundColor Red
exit;
}
}
function Connect-SPO($siteUrl) {
$clientContext = New-Object Microsoft.SharePoint.Client.ClientContext($siteUrl)
$clientContext.Credentials = $credentials
if (!$clientContext.ServerObjectIsNull.Value) {
Write-Host "Connected to SharePoint Online site: '$siteUrl'" -ForegroundColor Green
}
$rootWeb = $clientContext.Web
processWeb($rootweb)
}
function processWeb($web) {
$subWebs = $web.Webs
$clientContext.Load($web)
$clientContext.Load($web.AllProperties)
$clientContext.Load($subWebs)
try
{
$clientContext.ExecuteQuery()
}
catch
{
write-host "Error on $($clientContext) - $($_)" -ForegroundColor Red
Write-Host "It's possible you are not an administrator on the site collection - Exiting the script" -ForegroundColor Red
Sleep 10
Exit
}
Write-Host "Web URL:" $web.Url -ForegroundColor White
if ( $enableAllManagedProperties -ne "3" ) {
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()
$clientContext.ExecuteQuery()
# No need to process subwebs if we only mark site collection for indexing
if ($enableAllManagedProperties -ne "3") {
foreach ($subWeb in $subWebs) {
processWeb($subWeb)
}
}
}
function Set-AllManagedProperties( $web, $clientContext, $enableAllManagedProps ) {
$lists = $web.Lists
$clientContext.Load($lists)
$clientContext.ExecuteQuery()
foreach ($list in $lists) {
Write-Host "--" $list.Title
if ( $list.NoCrawl ) {
Write-Host "-- Skipping list due to not being crawled" -ForegroundColor Yellow
continue
}
$skip = $false;
$eventReceivers = $list.EventReceivers
$clientContext.Load($eventReceivers)
$clientContext.ExecuteQuery()
foreach ( $eventReceiver in $eventReceivers ) {
if ( $eventReceiver.ReceiverClass -eq "Microsoft.SharePoint.Publishing.CatalogEventReceiver" ) {
$skip = $true
Write-Host "-- Skipping list as it's published as a catalog" -ForegroundColor Yellow
break
}
}
if ( $skip ) {continue}
$folder = $list.RootFolder
$props = $folder.Properties
$clientContext.Load($folder)
$clientContext.Load($props)
$clientContext.ExecuteQuery()
if ( $enableAllManagedProps -eq "1" ) {
Write-Host "-- Enabling all managed properties" -ForegroundColor Green
$props["vti_indexedpropertykeys"] = "UAB1AGIAbABpAHMAaABpAG4AZwBDAGEAdABhAGwAbwBnAFMAZQB0AHQAaQBuAGcAcwA=|SQBzAFAAdQBiAGwAaQBzAGgAaQBuAGcAQwBhAHQAYQBsAG8AZwA=|"
$props["IsPublishingCatalog"] = "True"
}
if ( $enableAllManagedProps -eq "2" ) {
Write-Host "-- Disabling all managed properties" -ForegroundColor Green
$props["vti_indexedpropertykeys"] = $null
$props["IsPublishingCatalog"] = $null
}
$folder.Update()
$clientContext.ExecuteQuery()
}
}
#SPO Credentials
$credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($username, $Password)
Connect-SPO -siteUrl $siteurl
if ($version -ne "$null" ) {
Write-Host "Re-index has should now have been succesfully triggered for $siteurl - Please remember that this can take some time before the crawl picks up the index." -ForegroundColor Cyan
}
https://gallery.technet.microsoft.com/office/Re-index-a-Sharepoint-e70d285b
Note: This will not improve crawl time, merely ensure items are re-indexed.

Answer 2

You need to go to the Site Settings > Search and Offline Availability link and then press the reindex option as in below image.
You need to be site collection admin or owner to view these settings:
Updated as per comments:
To trigger a full site collections reindex, you need to make use of PS script as in this link.