Not working with elasticsearch aliases

Hi, I'm using filtered aliases to segment the data and they should work like indices , but for some reason are being ignored.

Go to Kibana Devtools and run the following:

DELETE test_animals

POST test_animals/_doc
{
  "name": "Peter Parker",
  "type": "dog"
}

POST test_animals/_doc
{
  "name": "Michael Jordan",
  "type": "cat"
}

POST _aliases 
{
  "actions": [
    {
      "add": {
        "index": "test_animals",
        "alias": "dogs",
        "filter": {
          "term": {
            "type.keyword": "dog"
          }
        }
      }
    },
    {
      "add": {
        "index": "test_animals",
        "alias": "cats",
        "filter": {
          "term": {
            "type.keyword": "cat"
          }
        }
      }
    }
  ]
}

This will generate two virtual indices based on one original indices, giving the the ability to run pdscan against segments of the data:

./pdscan elasticsearch+https://gustavo:gustavo@my-deployment-xxx:9200/cats --show-all --format ndjson --show-data
It should report only "michael jordan" but reports against all test_animals index.

Found 1 index to scan, sampling 10000 documents from each...

{"identifier":"test_animals.name","name":"surname","match_type":"value","confidence":"low","matches":["Michael Jordan","Peter Parker"],"matches_count":2}

Is this expected? how can I segment by a certain field?

Thanks!

Reproduce the alias setup in Kibana DevTools, then run the shown pdscan command against the cats alias and trace the Elasticsearch scan entry point handling that URL. Done means the cats scan reports only Michael Jordan rather than documents from test_animals.