Update 8.show-indexes.md

docs-2.0/3.ngql-guide/7.general-query-statements/6.show/8.show-indexes.md

@@ -1,6 +1,6 @@
 # SHOW INDEXES
 
-`SHOW INDEXES`语句显示现有的原生索引。
+`SHOW INDEXES`语句可以列出当前图空间内的所有Tag和Edge type（包括属性）的索引。
 
 ## 语法
 
@@ -12,18 +12,27 @@ SHOW {TAG | EDGE} INDEXES;
 
 ```ngql
 nebula> SHOW TAG INDEXES;
-+------------------+
-| Names            |
-+------------------+
-| "play_age_0"     |
-+------------------+
-| "player_index_0" |
-+------------------+
++------------------+--------------+-----------------+
+| Index Name       | By Tag       | Columns         |
++------------------+--------------+-----------------+
+| "fix"            | "fix_string" | ["p1"]          |
++------------------+--------------+-----------------+
+| "player_index_0" | "player"     | ["name"]        |
++------------------+--------------+-----------------+
+| "player_index_1" | "player"     | ["name", "age"] |
++------------------+--------------+-----------------+
+| "var"            | "var_string" | ["p1"]          |
++------------------+--------------+-----------------+
 
 nebula> SHOW EDGE INDEXES;
-+----------------+
-| Names          |
-+----------------+
-| "index_follow" |
-+----------------+
++----------------+----------+---------+
+| Index Name     | By Edge  | Columns |
++----------------+----------+---------+
+| "follow_index" | "follow" | []      |
++----------------+----------+---------+
 ```
+
+
+!!! Compatibility "历史版本兼容性"
+
+    Nebula Graph 2.0.1中， `SHOW TAG/EDGE INDEXES` 语句仅返回 `Names`。