Replace deprecated syntax for ES range queries

[rowanseymour]

We're still using the old deprecated syntax for range queries, e.g.

"created_on": {
  "from": "2018-06-23T00:00:00-04:00",
  "include_lower": true,
  "include_upper": true,
  "to": null
}

should be

"created_on": {
  "gte": "2018-06-23T00:00:00-04:00"
}

See elastic/elasticsearch#48538