Output message if an exception occurs during the execution attempt loop. Emit as a warning since later executions can be successful.

Author: cotti

src/Elastic.Documentation/ExternalCommands/ExternalCommandExecutor.cs

@@ -50,6 +50,7 @@ protected string[] CaptureMultiple(bool muteExceptions, int attempts, string bin
 			}
 			catch (Exception ex)
 			{
+				collector.EmitWarning("", $"An exception occurred on attempt {i} to capture output of {binary}: {ex?.Message}");
 				if (ex is not null)
 					e = ex;
 			}