Fix the Bootstrap check test failure on Windows. (#15975) (#15991)

(cherry picked from commit 1963714)

Co-authored-by: Mashhur <[email protected]>

x-pack/spec/config_management/bootstrap_check_spec.rb

@@ -120,7 +120,9 @@
       end
 
       context 'when a configuration file exists in the specified location' do
-        let(:config_location) { Stud::Temporary.file.path }
+        # gsub replacement is only for Windows platform, without `gsub` `Dir.glob` cannot discover files and test fails
+        # note that in other `Dir.glob` places, we used `File.join/dirname` operations which doesn't create issue on Windows
+        let(:config_location) { Stud::Temporary.file.path.gsub("\\", "/") }
 
         it "raises a `LogStash::BootstrapCheckError` error" do
           expect { subject.check(settings) }.to raise_error LogStash::BootstrapCheckError