Adding Query Processing Component Server in SharePoint 2013 Search

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Before

After

Script

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

Step #2 - Add the New Search Component on the WFE
# Add New Search Component
$wfe = Get-SPEnterpriseSearchServiceInstance -Identity "PROD-SPWFE02"
New-SPEnterpriseSearchQueryProcessingComponent -SearchTopology $clone -SearchServiceInstance $wfe

Note: If you see any error running the above command, run the below command first.
Start-SPEnterpriseSearchServiceInstance -Identity $wfe

Step #4 - Activate the Cloned Search Topology
# Activate Search Topology
Set-SPEnterpriseSearchTopology -Identity $clone

You are Done...!