If your Usage and Health Data Collection Proxy is in a stopped state here is a quick bit of PowerShell to to get it started:
$sap = Get-SPServiceApplicationProxy | where-object {$_.TypeName -eq “Usage and Health Data Collection Proxy”}
$sap.Provision()
The above can easily be adapted to allow you to start any Service Application Proxy.
Video: service application proxy sharepoint
This script will remove and re-add your content source‘s start addresses.
SharePoint will more or less rebuild the index for these sources, when the next full crawl is started.
$sourceName = "Local SharePoint sites"
$SSA = Get-SPEnterpriseSearchServiceApplication
$source = Get-SPEnterpriseSearchCrawlContentSource -Identity $sourceName -SearchApplication $SSA
$startaddresses = $source.StartAddresses | ForEach-Object { $_.OriginalString }
$source.StartAddresses.Clear()
ForEach ($address in $startaddresses ){ $source.StartAddresses.Add($address) }Error
SharePoint Crawl Log Error: The SharePoint item being crawled returned an error when attempting to download the item for example .aspx files
Solution :