Problem

One of SharePoint servers went down for a period of time, when it came back up, the Query Component status was still stuck at ‘Not Responding’.

Solution

We had to use a small PowerShell script to restart the Query Component on that server. Its status then changed to ‘Recovering’ and eventually ‘Online’.

Here is the script:

$SearchApp = Get-SPEnterpriseSearchServiceApplication -identity "Search Service Application"
$SearchApp | Get-SPEnterpriseSearchQueryTopology | Get-SPEnterpriseSearchQueryComponent | Where-Object {$_.ServerName -eq 'server name'} | Restart-SPEnterpriseSearchQueryComponent