Adding a Crawler Component Server in SharePoint 2013 Search

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Before

After

Script

Step 1 : Get Search Service Instance and Start on New Crawl Server
$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 Crawl Component
New-SPEnterpriseSearchCrawlComponent -SearchTopology $clone -SearchServiceInstance $ssi

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

Step 5 : Review new topology
Get-SPEnterpriseSearchTopology -Active -SearchApplication $ssa

Step 6 : Monitor Distribution of Index
Get-SPEnterpriseSearchStatus -SearchApplication $ssa

You are Done...!