Adding an Index Partition Component Server in SharePoint 2013 Search

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Before

After

Script

!...Add a new Index Partition Server...!

If you have not already started the Search Service Instance on the server, use this to start.

$ssi = Get-SPEnterpriseSearchServiceInstance -Identity "PROD-SPAPP02"
Start-SPEnterpriseSearchServiceInstance -Identity $ssi
Get-SPEnterpriseSearchServiceInstance -Identity $ssi

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Step 1: Clone the Active Search Topology
#Clone Active Search Topology
$ssa = Get-SPEnterpriseSearchServiceApplication
$active = Get-SPEnterpriseSearchTopology -SearchApplication $ssa -Active
$clone = New-SPEnterpriseSearchTopology -SearchApplication $ssa -Clone –SearchTopology $active

Step 2: Create the New Index Component on the WFE 
#Create New Index Component for Index Partition 0
New-SPEnterpriseSearchIndexComponent –SearchTopology $clone -SearchServiceInstance $ssi -IndexPartition 0 -RootDirectory "D:\FGApps\Index"

Step 3: Activate the Cloned Search Topology with the New Index Component
#Activate the Cloned Search Topology
Set-SPEnterpriseSearchTopology -Identity $clone

You are Done...!