Cherry-pick #18814 to 7.x: Fix install service script for windows

dev-tools/packaging/packages.yml

@@ -144,7 +144,7 @@ shared:
     files:
       <<: *agent_binary_files
       install-service-{{.BeatName}}.ps1:
-        template: '{{ elastic_beats_dir }}/dev-tools/packaging/templates/windows/install-service.ps1.tmpl'
+        template: '{{ elastic_beats_dir }}/dev-tools/packaging/templates/windows/install-service-elastic-agent.ps1.tmpl'
         mode: 0755
       uninstall-service-{{.BeatName}}.ps1:
         template: '{{ elastic_beats_dir }}/dev-tools/packaging/templates/windows/uninstall-service.ps1.tmpl'

dev-tools/packaging/templates/windows/install-service-elastic-agent.ps1.tmpl

@@ -0,0 +1,20 @@
+# Delete and stop the service if it already exists.
+if (Get-Service {{.BeatName}} -ErrorAction SilentlyContinue) {
+  $service = Get-WmiObject -Class Win32_Service -Filter "name='{{.BeatName}}'"
+  $service.StopService()
+  Start-Sleep -s 1
+  $service.delete()
+}
+
+$workdir = Split-Path $MyInvocation.MyCommand.Path
+
+# Create the new service.
+New-Service -name {{.BeatName}} `
+  -displayName {{.BeatName | title}} `
+  -binaryPathName "`"$workdir\{{.BeatName}}.exe`" --path.home `"$workdir`" --path.data  `"$workdir\data`" run"
+
+# Attempt to set the service to delayed start using sc config.
+Try {
+  Start-Process -FilePath sc.exe -ArgumentList 'config {{.BeatName}} start= delayed-auto'
+}
+Catch { Write-Host -f red "An error occured setting the service to delayed start." }

x-pack/elastic-agent/CHANGELOG.asciidoc

@@ -42,6 +42,7 @@
 - Avoid watching monitor logs {pull}18723[18723]
 - Correctly report platform and family. {issue}18665[18665]
 - Guard against empty stream.datasource and namespace {pull}18769[18769]
+- Fix install service script for windows {pull}18814[18814]
 
 ==== New features