azure-pipelines.yml: Consistently use $env: instead of $Env: for environment variables
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 067031d..1e44f50 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -137,7 +137,7 @@
             skipSdkInstallation='true'
         }
         [string[]]$tasks = @($primaryCommand)
-        if ($Env:RunTests -ne 'false') {
+        if ($env:RunTests -ne 'false') {
             [string[]]$tasks = $primaryCommand,'Publish'
         }
         Invoke-psake $(BuildDirectory)/build.ps1 -Task $tasks -properties $properties -parameters $parameters
@@ -156,17 +156,17 @@
 
     - pwsh: |
         # Generate a lucene.testsettings.json file for use with the test framework
-        $assert = if ($Env:AssertsEnabled -ne 'false') { 'true' } else { 'false' }
-        $nightly = if ($Env:IsNightly -eq 'true') { 'true' } else { 'false' }
-        $weekly = if ($Env:IsWeekly -eq 'true') { 'true' } else { 'false' }
-        $slow = if ($Env:RunSlowTests -ne 'false') { 'true' } else { 'false' }
-        $awaitsFix = if ($Env:RunAwaitsFixTests -ne 'false') { 'true' } else { 'false' }
-        $codec = if ($Env:Codec -eq $null) { 'random' } else { $Env:Codec }
-        $docValuesFormat = if ($Env:DocValuesFormat -eq $null) { 'random' } else { $Env:DocValuesFormat }
-        $postingsFormat = if ($Env:PostingsFormat -eq $null) { 'random' } else { $Env:PostingsFormat }
-        $directory = if ($Env:Directory -eq $null) { 'random' } else { $Env:Directory }
-        $verbose = if ($Env:Verbose -eq 'true') { 'true' } else { 'false' }
-        $multiplier = if ($Env:Multiplier -eq $null) { '1' } else { $Env:Multiplier }
+        $assert = if ($env:AssertsEnabled -ne 'false') { 'true' } else { 'false' }
+        $nightly = if ($env:IsNightly -eq 'true') { 'true' } else { 'false' }
+        $weekly = if ($env:IsWeekly -eq 'true') { 'true' } else { 'false' }
+        $slow = if ($env:RunSlowTests -ne 'false') { 'true' } else { 'false' }
+        $awaitsFix = if ($env:RunAwaitsFixTests -ne 'false') { 'true' } else { 'false' }
+        $codec = if ($env:Codec -eq $null) { 'random' } else { $env:Codec }
+        $docValuesFormat = if ($env:DocValuesFormat -eq $null) { 'random' } else { $env:DocValuesFormat }
+        $postingsFormat = if ($env:PostingsFormat -eq $null) { 'random' } else { $env:PostingsFormat }
+        $directory = if ($env:Directory -eq $null) { 'random' } else { $env:Directory }
+        $verbose = if ($env:Verbose -eq 'true') { 'true' } else { 'false' }
+        $multiplier = if ($env:Multiplier -eq $null) { '1' } else { $env:Multiplier }
         $fileText = "{`n`t" +
             """assert"": ""$assert"",`n`t" +
             """tests"": {`n`t`t" +
diff --git a/build/azure-templates/publish-test-results.yml b/build/azure-templates/publish-test-results.yml
index 0fe4548..7c75d5f 100644
--- a/build/azure-templates/publish-test-results.yml
+++ b/build/azure-templates/publish-test-results.yml
@@ -60,7 +60,7 @@
                     $testResults = "Tests failed: $failed, passed: $passed, ignored: $ignored"
                     Write-Host "##vso[task.setvariable variable=TestResults;]$testResults"
                     # Report a running total of failures
-                    $totalFailures = ([int]$Env:TOTALFAILURES + [int]$failed).ToString()
+                    $totalFailures = ([int]$env:TOTALFAILURES + [int]$failed).ToString()
                     Write-Host "##vso[task.setvariable variable=TotalFailures;]$totalFailures"
                     break;
                 }
diff --git a/build/azure-templates/run-tests-on-os.yml b/build/azure-templates/run-tests-on-os.yml
index c808ba6..d2ee257 100644
--- a/build/azure-templates/run-tests-on-os.yml
+++ b/build/azure-templates/run-tests-on-os.yml
@@ -224,7 +224,7 @@
 
 - pwsh: |
     $maximumAllowedFailures = '${{ parameters.maximumAllowedFailures }}'
-    if ([int]$Env:TOTALFAILURES -gt [int]$maximumAllowedFailures) {
-        Write-Host "##vso[task.logissue type=error;]Test run failed due to too many failed tests. Maximum failures allowed: $maximumAllowedFailures, total failures: $($Env:TOTALFAILURES)."
+    if ([int]$env:TOTALFAILURES -gt [int]$maximumAllowedFailures) {
+        Write-Host "##vso[task.logissue type=error;]Test run failed due to too many failed tests. Maximum failures allowed: $maximumAllowedFailures, total failures: $($env:TOTALFAILURES)."
         Write-Host "##vso[task.complete result=Failed;]"
     }
\ No newline at end of file
diff --git a/build/build.ps1 b/build/build.ps1
index 6319ccf..eeeb1c0 100644
--- a/build/build.ps1
+++ b/build/build.ps1
@@ -55,7 +55,7 @@
 
 $backedUpFiles = New-Object System.Collections.ArrayList
 if ($IsWindows -eq $null) {
-    $IsWindows = $Env:OS.StartsWith('Windows')
+    $IsWindows = $env:OS.StartsWith('Windows')
 }
 
 task default -depends Pack