Bulked script error: "Only sibling pipeline aggregations are allowed at the top level", and how to add scripts to my json input on my visualization

[Celso_Agra]

I'm new on elasticsearch and painless language.

I'm trying to understand what kind of error is occuring and why, is that occurs.

Here is my code, below:

GET  club/_search
{
    "query" : {
        "match_all": {}
    },
    "aggs" : {
        "total" : {
        	"value_count" : {
        		"field" : "is_member"
        	}
        },
        "total_of_members" : {
            "sum" : {
                "script" : {
                   "source": "doc['is_member'].value ? 1 : 0"
                }
            }
        },
        "total_percentage_of_members": {
          "bucket_script": {
              "buckets_path": {
                "total_members": "total_of_members",
                "total_all": "total"
              },
              "script": "params.total_members / params.total_all * 100"
          }
        }
    }
}

When I run this example, I got an message error:
Invalid pipeline aggregation named [total_percentage_of_members] of type [bucket_script]. Only sibling pipeline aggregations are allowed at the top level

But, when I just remove total_percentage_of_members, everything works fine.

I tried to create a nested structure of aggs, but I'm still getting error. Does anyone can help me?

Also,

would be possible to add this script to my "JSON Input" on my visualizations?