Unable to parse BaseAggregationBuilder

Good afternoon, I am trying to build an elastic watcher query using nested aggs, that feed the variables into a bucket script that will subtract one field from another, then put that value into a watcher on a threashold. I've done plenty of watchers on standard searches on logs which work great. But this is a bit of a different beast to me.

I am hoping that I am doing something syntactically wrong on my first step of building the nested agg.

I read through this as my "yellow brick road"
https://www.elastic.co/guide/en/elasticsearch/reference/7.5/search-aggregations-pipeline.html

When I run this, I get all the topics back:

GET /metricbeat-7.4.0-2020.01.31-000051/_search
{

  "size": 0,
  "aggs": {
    "group_by_topic": {
      "terms": {
        "field": "kafka.topic.name",
        "size": 50
      } 
    }
    }

}

}

But when I run this in dev tools I get back object not found exception. I checked to make sure that the agg was nested, but it's not working out too well.

GET /metricbeat-7.4.0-2020.01.31-000051/_search
{

  "size": 0,
  "aggs": {
    "group_by_topic": {
      "terms": {
        "field": "kafka.topic.name",
        "size": 50
      } 
    },
    "aggs": {
      "sum_partition_offset_newest":{ "sum": { "field": "kafka.partition.offset.newest" }
      }
    }

}

}

"type": "named_object_not_found_exception",
"reason": "[12:37] unable to parse BaseAggregationBuilder with name 
[sum_partition_offset_newest]: parser not found"

can you try to nest the aggs: sum_partition_offset_newest part within the group_by_topic field?

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