add more basic elastic options.

weed/command/scaffold.go

@@ -176,7 +176,11 @@ database = "seaweedfs"
 
 [elastic7]
 enabled = false
-servers = "http://localhost:9200"
+servers = "http://localhost1:9200,http://localhost2:9200,http://localhost3:9200"
+username = ""
+password = ""
+sniff_enabled = false
+healthcheck_enabled = false
 # increase the value is recommend, be sure the value in Elastic is greater or equal here
 index.max_result_window = 10000
 `