How to request a single document by _id via alias?

Question

Is it possible to request a single document by its id by querying an alias, provided that all keys across all indices in the alias are unique (it is an external guarantee)?<

Answer 1

7.2 version Docs suggest:

GET /_search
{
    "query": {
        "ids" : {
            "values" : ["1", "4", "100"]
        }
    }
}

Response should look like:

{
  "took": 0,
  "timed_out": false,
  "_shards": {
    "total": 2,
    "successful": 2,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 1,
      "relation": "eq"
    },
    "max_score": 1.0,
    "hits": [
      {
        "_index": "indexwhatever",
        "_type": "_doc",
        "_id": "anyID",
        "_score": 1.0,
        "_source": {
          "field1": "value1",
          "field2": "value2"
        }
      }
    ]
  }
}