anchor.diff:    },
   -------------------------------------------------
   // NOTCONSOLE
  -<1> Elasticsearch Date math is used to select the Logstash indices that contain the meetup data. The second pattern is needed in case the previous hour crosses days.
  +<1> `logstash` is the default <<indices-add-alias,index alias>> for the {ls}
  +indices containing the meetup data. By default, the {ls}
  +<<index-lifecycle-management,{ilm} ({ilm-init})>> policy rolls this alias to a
  +new index when the index size reaches 50GB or becomes 30 days old. For more
  +information, see
  +{logstash-ref}/plugins-outputs-elasticsearch.html#plugins-outputs-elasticsearch-ilm[{ilm-init}
  +defaults in Logstash].
   <2> Find all of the RSVPs with `Open Source` as a topic.
   <3> Group the RSVPs by city.
   <4> Consolidate multiple RSVPs for the same event.
  
positive.code:   },
    "condition": {
      "compare": {
        "ctx.payload.hits.total.value": {
          "gt": 0
        }
      }
  
negative.code:           "aggs": {
              "group_by_city": {
                "terms": {
                  "field": "group.group_city.keyword",
                  "size": 5
                },
                "aggs": {
                  "group_by_event": {
                    "terms": {
                      "field": "event.event_url.keyword",
                      "size": 5
                    },
                    "aggs": {
  