[Pick 2.1](inverted index) support inverted index format v2 (#30145) (#32418)

fe/fe-common/src/main/java/org/apache/doris/common/Config.java

@@ -2505,6 +2505,12 @@ public class Config extends ConfigBase {
             options = {"default", "ranger-doris"})
     public static String access_controller_type = "default";
 
+    @ConfField(mutable = true, masterOnly = true, description = {
+            "倒排索引默认存储格式",
+            "Default storage format of inverted index, the default value is V1."
+    })
+    public static String inverted_index_storage_format = "V1";
+
     //==========================================================================
     //                    begin of cloud config
     //==========================================================================