remove einterface gets (#7455)

api4/elasticsearch.go

@@ -30,7 +30,7 @@ func testElasticsearch(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err := app.TestElasticsearch(cfg); err != nil {
+	if err := c.App.TestElasticsearch(cfg); err != nil {
 		c.Err = err
 		return
 	}
@@ -44,7 +44,7 @@ func purgeElasticsearchIndexes(c *Context, w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	if err := app.PurgeElasticsearchIndexes(); err != nil {
+	if err := c.App.PurgeElasticsearchIndexes(); err != nil {
 		c.Err = err
 		return
 	}