fix response body

Signed-off-by: Tokesh <[email protected]>

spec/namespaces/sql.yaml

@@ -55,7 +55,7 @@ paths:
   /_plugins/_sql/stats:
     get:
       operationId: sql.get_stats.0
-      x-operation-group: sql.stats
+      x-operation-group: sql.get_stats
       x-version-added: '1.0'
       description: By a stats endpoint, you are able to collect metrics for the plugin within the interval.
       externalDocs:
@@ -202,6 +202,12 @@ components:
           schema:
             $ref: '../schemas/sql._common.yaml#/components/schemas/SqlCloseResponse'
       required: true
+    sql.stats@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/sql._common.yaml#/components/schemas/SqlStatsResponse'
+      required: true
     sql.get_stats@200:
       content:
         application/json: