refresh thread pool to use scaling with default size of 10

Author: kimchy

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

@@ -96,7 +96,7 @@ public ThreadPool(Settings settings) {
         executors.put(Names.MANAGEMENT, build(Names.MANAGEMENT, "scaling", groupSettings.get(Names.MANAGEMENT), settingsBuilder().put("keep_alive", "5m").put("size", 5).build()));
         executors.put(Names.FLUSH, build(Names.FLUSH, "scaling", groupSettings.get(Names.FLUSH), settingsBuilder().put("keep_alive", "5m").put("size", 10).build()));
         executors.put(Names.MERGE, build(Names.MERGE, "scaling", groupSettings.get(Names.MERGE), settingsBuilder().put("keep_alive", "5m").put("size", 20).build()));
-        executors.put(Names.REFRESH, build(Names.REFRESH, "cached", groupSettings.get(Names.REFRESH), settingsBuilder().put("keep_alive", "1m").build()));
+        executors.put(Names.REFRESH, build(Names.REFRESH, "scaling", groupSettings.get(Names.REFRESH), settingsBuilder().put("keep_alive", "5m").put("size", 10).build()));
         executors.put(Names.CACHE, build(Names.CACHE, "scaling", groupSettings.get(Names.CACHE), settingsBuilder().put("keep_alive", "5m").put("size", 4).build()));
         executors.put(Names.SNAPSHOT, build(Names.SNAPSHOT, "scaling", groupSettings.get(Names.SNAPSHOT), settingsBuilder().put("keep_alive", "5m").put("size", 5).build()));
         executors.put(Names.SAME, new ExecutorHolder(MoreExecutors.sameThreadExecutor(), new Info(Names.SAME, "same")));