Adding an Admin Component Server in SharePoint 2013 Search

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 Before

After

Script

Step 1: Get Search Service Instance and Start
$ssi = Get-SPEnterpriseSearchServiceInstance -Identity "PROD-SPAPP02"

In case your Search Service Instance is not Online, run below commands and wait...
Start-SPEnterpriseSearchServiceInstance -Identity $ssi
Get-SPEnterpriseSearchServiceInstance -Identity $ssi

Step 2: Clone Active Search Topology 
$ssa = Get-SPEnterpriseSearchServiceApplication
$active = Get-SPEnterpriseSearchTopology -SearchApplication $ssa -Active
$clone = New-SPEnterpriseSearchTopology -SearchApplication $ssa -Clone –SearchTopology $active

Step 3: Add New Admin Component
New-SPEnterpriseSearchAdminComponent -SearchTopology $clone -SearchServiceInstance $ssi

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

You are Done...!