How can I get last arrived document ElasticSearch?

Question

I have a cluster with documents that contains timestamp field.

How can i request for the last arrived of them?

Answer 1

A query like the one below should do the trick. It'll get you the one document with the latest date in the timestamp field.

{
  "size": 1,
  "query": {
    "match_all": {}
  },
  "sort": {
    "timestamp": "desc"
  }
}