Add-PSSnapin *share* -ErrorAction SilentlyContinue

#Find the Search Service that we are changing the topology - note the ID
Get-SPEnterpriseSearchServiceApplication

#----------------------step1----------------------------------------------#


write "please run only step 1"
#variables

$q3="SD5-Query03"
$q4="SD5-Query04"
$ssaID = <INSERT_Search_Service_GUID_HERE>


$hostC = Get-SPEnterpriseSearchServiceInstance -Identity $q3
$hostD = Get-SPEnterpriseSearchServiceInstance -Identity $q4




$ssa = Get-SPEnterpriseSearchServiceApplication -Identity $ssaID
$active = Get-SPEnterpriseSearchTopology -SearchApplication $ssa -Active
$clone = New-SPEnterpriseSearchTopology -SearchApplication $ssa -Clone -SearchTopology $active

#add index partition 1 to query servers
New-SPEnterpriseSearchIndexComponent -SearchTopology $clone -SearchServiceInstance $hostC -RootDirectory "E:\SP13_Index01" -IndexPartition 1
New-SPEnterpriseSearchIndexComponent -SearchTopology $clone -SearchServiceInstance $hostD -RootDirectory "E:\SP13_Index01" -IndexPartition 1

#activate topology
$clone.Activate()

#-------------------------step2 - RUN ONLY AFTER THE NEW SEARCH SEARVICE IS IN PRODUCTION-------#

#Find the OLD Search Service that we are REMOVING - note the ID
Get-SPEnterpriseSearchServiceApplication

#variables
$wfePrefix = "SD5-FE"
$ssaID = <INSERT_OLD_Search_Service_GUID_HERE>

$answer=read-host "Are you sure you want to run step 2? y/n"
if($answer -eq "y")
{

    $ssa = Get-SPEnterpriseSearchServiceApplication -Identity $ssaID
    $active = Get-SPEnterpriseSearchTopology -SearchApplication $ssa -Active
    $clone = New-SPEnterpriseSearchTopology -SearchApplication $ssa -Clone -SearchTopology $active

    #remove search components from WFEs
    Get-SPEnterpriseSearchComponent -SearchTopology $clone | ? {$_.ServerName -like "*$wfePrefix*"} | %{

    Remove-SPEnterpriseSearchComponent -Identity $_.ComponentId.GUID -SearchTopology $clone -Confirm:$false

    }
    #activate topology
    $clone.Activate()

    #stop search services on WFEs
    Get-SPEnterpriseSearchServiceInstance | ? server -like "*$wfePrefix*" | Stop-SPEnterpriseSearchServiceInstance
    Get-SPEnterpriseSearchQueryAndSiteSettingsServiceInstance | ? server -like "*$wfePrefix*" | Stop-SPEnterpriseSearchQueryAndSiteSettingsServiceInstance

}