Use TaskExecutionTimeTrackingEsThreadPoolExecutor for system writes (#96971)

Relates ES-6248

Author: pxsalehi

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

@@ -234,14 +234,14 @@ public ThreadPool(final Settings settings, final ExecutorBuilder<?>... customBui
             new ScalingExecutorBuilder(Names.FETCH_SHARD_STORE, 1, 2 * allocatedProcessors, TimeValue.timeValueMinutes(5), false)
         );
         builders.put(Names.SYSTEM_READ, new FixedExecutorBuilder(settings, Names.SYSTEM_READ, halfProcMaxAt5, 2000, false));
-        builders.put(Names.SYSTEM_WRITE, new FixedExecutorBuilder(settings, Names.SYSTEM_WRITE, halfProcMaxAt5, 1000, false));
+        builders.put(Names.SYSTEM_WRITE, new FixedExecutorBuilder(settings, Names.SYSTEM_WRITE, halfProcMaxAt5, 1000, true));
         builders.put(
             Names.SYSTEM_CRITICAL_READ,
             new FixedExecutorBuilder(settings, Names.SYSTEM_CRITICAL_READ, halfProcMaxAt5, 2000, false)
         );
         builders.put(
             Names.SYSTEM_CRITICAL_WRITE,
-            new FixedExecutorBuilder(settings, Names.SYSTEM_CRITICAL_WRITE, halfProcMaxAt5, 1500, false)
+            new FixedExecutorBuilder(settings, Names.SYSTEM_CRITICAL_WRITE, halfProcMaxAt5, 1500, true)
         );
 
         for (final ExecutorBuilder<?> builder : customBuilders) {

server/src/test/java/org/elasticsearch/threadpool/ThreadPoolTests.java

@@ -355,6 +355,11 @@ public void testWriteThreadPoolUsesTaskExecutionTimeTrackingEsThreadPoolExecutor
         final ThreadPool threadPool = new TestThreadPool("test", Settings.EMPTY);
         try {
             assertThat(threadPool.executor(ThreadPool.Names.WRITE), instanceOf(TaskExecutionTimeTrackingEsThreadPoolExecutor.class));
+            assertThat(threadPool.executor(ThreadPool.Names.SYSTEM_WRITE), instanceOf(TaskExecutionTimeTrackingEsThreadPoolExecutor.class));
+            assertThat(
+                threadPool.executor(ThreadPool.Names.SYSTEM_CRITICAL_WRITE),
+                instanceOf(TaskExecutionTimeTrackingEsThreadPoolExecutor.class)
+            );
         } finally {
             assertTrue(terminate(threadPool));
         }