Increase stateless default refresh interval (elastic#97225)

For non-fast-refresh indices

Author: kingherc

server/src/main/java/org/elasticsearch/index/IndexSettings.java

@@ -268,7 +268,7 @@ public final class IndexSettings {
         TimeValue.MINUS_ONE,
         Property.NodeScope
     ); // TODO: remove setting
-    public static TimeValue STATELESS_DEFAULT_REFRESH_INTERVAL = TimeValue.timeValueSeconds(5); // TODO: settle on right value
+    public static TimeValue STATELESS_DEFAULT_REFRESH_INTERVAL = TimeValue.timeValueSeconds(10); // TODO: settle on right value
     public static final Setting<TimeValue> INDEX_REFRESH_INTERVAL_SETTING = Setting.timeSetting("index.refresh_interval", (settings) -> {
         if (EXISTING_SHARDS_ALLOCATOR_SETTING.get(settings).equals("stateless") && INDEX_FAST_REFRESH_SETTING.get(settings) == false) {
             return STATELESS_DEFAULT_REFRESH_INTERVAL;