$domain = (Get-ChildItem env:userdomain).value
$tempsqlserver = (Get-ChildItem env:computername).value
$tempsearchserver = (Get-ChildItem env:computername).value
$tempcrawluser = $domain.ToString() + '\sp_content'

$databaseName = "Search_Service_DB"
$searchSAName = "SharePoint Server Search"
$saAppPoolName = "Default SharePoint Service App Pool"	# Make sure this matches an existing service app pool
$crawlPwd = "pass@word1"	# Make sure you escape any $ characters in the password


$sqlserver = Read-Host -Prompt "Enter SQL Instance name. Press Enter for $tempsqlserver"
If ($sqlserver -eq "") {$sqlserver = $tempsqlserver}

$searchServerName = Read-Host -Prompt "Enter Search Server name. Press Enter for $tempsearchserver"
If ($searchServerName -eq "") {$searchServerName = $tempsearchserver}

$crawlUser = Read-Host -Prompt "Enter Content Crawl Username. Press Enter for $tempcrawluser"
If ($crawlUser -eq "") {$crawlUser  = $tempcrawluser}


##START SEARCH 

Write-Host "Creating Search Service and Proxy..."
Write-Host "  Starting Services..."
Start-SPEnterpriseSearchServiceInstance $searchServerName
Start-SPEnterpriseSearchQueryAndSiteSettingsServiceInstance $searchServerName 

Write-Host "  Creating Search Application..."
$searchApp = New-SPEnterpriseSearchServiceApplication -Name $searchSAName -ApplicationPool $saAppPoolName -DatabaseServer $sqlserver -DatabaseName $databaseName
$searchInstance = Get-SPEnterpriseSearchServiceInstance $searchServerName 

Write-Host "  Creating Administration Component..."
$searchApp | Get-SPEnterpriseSearchAdministrationComponent | Set-SPEnterpriseSearchAdministrationComponent -SearchServiceInstance $searchInstance  

##Crawl
Write-Host "  Creating Crawl Component..."
$InitialCrawlTopology = $searchApp | Get-SPEnterpriseSearchCrawlTopology -Active
$CrawlTopology = $searchApp | New-SPEnterpriseSearchCrawlTopology
$CrawlDatabase = ([array]($searchApp | Get-SPEnterpriseSearchCrawlDatabase))[0]
$CrawlComponent = New-SPEnterpriseSearchCrawlComponent -CrawlTopology $CrawlTopology -CrawlDatabase $CrawlDatabase -SearchServiceInstance $searchInstance
$CrawlTopology | Set-SPEnterpriseSearchCrawlTopology -Active 

## Got Error here
Write-Host -ForegroundColor white "  Waiting for the old crawl topology to become inactive" -NoNewline 
do {write-host -NoNewline .;Start-Sleep 6;} while ($InitialCrawlTopology.State -ne "Inactive")
$InitialCrawlTopology | Remove-SPEnterpriseSearchCrawlTopology -Confirm:$false
Write-Host   

##Query
Write-Host "  Creating Query Component..."

$InitialQueryTopology = $searchApp | Get-SPEnterpriseSearchQueryTopology -Active
$QueryTopology = $searchApp | New-SPEnterpriseSearchQueryTopology -Partitions 1 
$IndexPartition= (Get-SPEnterpriseSearchIndexPartition -QueryTopology $QueryTopology)
$QueryComponent = New-SPEnterpriseSearchQuerycomponent -QueryTopology $QueryTopology -IndexPartition $IndexPartition -SearchServiceInstance $searchInstance
$PropertyDatabase = ([array]($searchApp | Get-SPEnterpriseSearchPropertyDatabase))[0] 
$IndexPartition | Set-SPEnterpriseSearchIndexPartition -PropertyDatabase $PropertyDatabase
$QueryTopology | Set-SPEnterpriseSearchQueryTopology -Active  

Write-Host "  Creating Proxy..."
$searchAppProxy = New-SPEnterpriseSearchServiceApplicationProxy -Name "$searchSAName Proxy" -SearchApplication $searchSAName > $null 

# Set Default Content Crawl Account
$c = New-Object Microsoft.Office.Server.Search.Administration.Content($searchapp) 
$c.SetDefaultGatheringAccount($crawlUser, (ConvertTo-SecureString $crawlPwd -AsPlainText -force))


#####END SEARCH