gistfile1.txt

"sort": {
    "_script": {
      "script": "long lowestPublishedAt; for (int i = 0; i < _source.sources.size(); i++) { Boolean foundInList = false; for (int x = 0; x < external_ids.size(); x++) { if (external_ids[x] == _source.sources[i].external_id) { foundInList = true; break; } } if (foundInList) { if (i == 0 || _source.sources[i].published_at < lowestPublishedAt) { lowestPublishedAt = _source.sources[i].published_at; } } } return lowestPublishedAt;",
      "type": "number",
      "params": {
        "external_ids": [
          "a99240f3",
          "a217f93"
        ]
      },
      "order": "asc"
    }
  },