Merge pull request #13718 from mikemccand/catch_throwable

LoggingRunnable.run should catch and log all errors, not just Exception

core/src/main/java/org/elasticsearch/threadpool/ThreadPool.java

@@ -511,8 +511,8 @@ public class ThreadPool extends AbstractComponent {
         public void run() {
             try {
                 runnable.run();
-            } catch (Exception e) {
-                logger.warn("failed to run {}", e, runnable.toString());
+            } catch (Throwable t) {
+                logger.warn("failed to run {}", t, runnable.toString());
             }
         }