Updated settings from "index.is.warm" to "index.warm" as part of PR comments opensearch-project#17490

Signed-off-by: Mayank Sharma <[email protected]>

Author: mayanksharma27

server/src/main/java/org/opensearch/index/IndexModule.java

@@ -155,7 +155,7 @@ public final class IndexModule {
         Property.NodeScope
     );
 
-    public static final Setting<Boolean> IS_WARM_INDEX_SETTING = Setting.boolSetting("index.is.warm", false, Property.IndexScope);
+    public static final Setting<Boolean> IS_WARM_INDEX_SETTING = Setting.boolSetting("index.warm", false, Property.IndexScope);
 
     public static final Setting<String> INDEX_RECOVERY_TYPE_SETTING = new Setting<>(
         "index.recovery.type",