[Doc]Update External_table.md (StarRocks#12962)

* Update External_table.md

* Update External_table.md

docs/data_source/External_table.md

@@ -127,7 +127,8 @@ PROPERTIES (
     "user" = "root",
     "password" = "root",
     "index" = "tindex",
-    "type" = "doc"
+    "type" = "doc",
+    "es.net.ssl" = "true"
 );
 ~~~
 
@@ -143,6 +144,10 @@ Parameters
 
   * true: StarRocks only uses the addresses specified by `hosts` to access the Elasticsearch cluster and fetch data and does not sniff data nodes which shards of the Elasticsearch index reside in. If StarRocks cannot access the addresses of the data nodes inside the Elasticsearch cluster, you need to set this parameter to `true`.
   * false: default value. StarRocks uses the addresses specified by `host` to sniff data nodes on which the shards of the Elasticsearch cluster indexes are located. After StarRocks generates a query execution plan, the relevant BEs directly access the data nodes inside the Elasticsearch cluster to fetch data from the shards of indexes. If StarRocks can access the addresses of the data nodes inside the Elasticsearch cluster, we recommend that you retain the default value `false`.
+**es.net.ssl**: Whether the HTTPS protocol can be used to access your Elasticsearch cluster. Only StarRocks 2.4 and later versions suppprt configuring this parameter.
+
+  * `true`: The HTTPS protocol can be used to access your Elasticsearch cluster (Additionaly, the HTTP protocol is supported).
+  * `false`: The HTTPS protocol cannot be used to access your Elasticsearch cluster. Only the HTTP protocol is supported.
 
 ### Predicate pushdown