Elasticsearch match_phrase_prefix Vs wild card

Elastic Stack Elasticsearch
1

This query use phrase prefix and returns 5k records

POST index/_search
{
  "from": 0,
  "size": 10,
  "query": {
    "match_phrase_prefix": {
      "Identifiers.Identifier.$": {
        "query": "nct"
        "max_expansions": 1024

      }
    }
  }
}

When I use following query with wild card it gives me 200K results

GET index/_search
{
  "from": 0,
  "size": 10,
  "query": {
    "query_string": {
      "fields": [
        "Identifiers.Identifier.$"
      ],
      "query": "nct*",
      "analyze_wildcard": true,
      "boost": 2
    }
  }
}

Most of my values in Identifiers has NCT in it , why do I see such a big difference in both these results ?

2

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