Index multiple payload hits to hits array in new index

Hello,

I am developing a watch that needs access to previous watch payload data. Since the watch scope is that of itself, I was thinking that an index action to index the desired payload for future reference was the way to go. However, I am running into an issue where the indexed payload gets indexed in the "_docs" array. This makes it difficult to access this array using mustache templating in watcher. Also, I am not sure if this will affect index management as I will want to remove older hits in the index.

It makes sense why my code is indexing into the docs array but I was wondering if I can index directly into the hits array similar to how a query output structure looks.

Here's the index action:

"index_payload": {
      "condition": {
        "compare": {
          "ctx.vars.secondQuery.hits.total": {
            "gt": 0
          }
        }
      },
      "transform": {
        "script": {
          "source": "return [' _doc' : ctx.vars.highLoad ]",
          "lang": "painless"
        }
      },
      "index": {
        "index": "cf-server-load-watch-logs"
      }
    }

Where ctx.vars.highLoad is a payload object containing multiple hits.

The output of the index is:

{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "cf-server-load-watch-logs",
        "_type" : "_doc",
        "_id" : "ycHqzXYBPx5Zh6tJB_TX",
        "_score" : 1.0,
        "_source" : {
          " _doc" : [
            {
              "_index" : "gpg-metricbeat-2021.01",
              "_type" : "_doc",
              "_source" : {
                "@timestamp" : "2021-01-04T14:59:36.679Z",
                "system" : {
                  "load" : {
                    "1" : 137.15,
                    "cores" : 96,
                    "15" : 108.77,
                    "5" : 124.51,
                    "norm" : {
                      "1" : 1.4286,
                      "15" : 1.133,
                      "5" : 1.297
                    }
                  }
                },
              },
              "_id" : "7ObpzXYBKOxPS2foJiyR",
              "_score" : 2.0
            },
            {
              "_index" : "gpg-metricbeat-2021.01",
              "_type" : "_doc",
              "_source" : {
                "@timestamp" : "2021-01-04T15:00:11.520Z",
                "system" : {
                  "load" : {
                    "1" : 143.33,
                    "cores" : 96,
                    "15" : 124.06,
                    "5" : 135.19,
                    "norm" : {
                      "1" : 1.493,
                      "15" : 1.2923,
                      "5" : 1.4082
                    }
                  }
                },
              },
              "_id" : "LSPpzXYBH3imBevIrv2l",
              "_score" : 2.0
            }
          ]
        }
      }
    ]
  }
}

So, ideally I would like to have those 2 hits as separate hits in the hits array not in the docs array.

Thanks in advance.