simple query string with flags returns no results

[Daniel Nill]

curl -XPUT "http://0.0.0.0:9200/users"; -d '{
  "first_name": "daniel",
  "last_name": "nill"
}'


curl -XGET 'http://0.0.0.0:9200/users/_search"; -d '{
  "query": {
    "bool": {
      "must": {
        "simple_query_string": {

          "query":"daniel nill",
          "fields":[
            "lastname^6.5",
            "firstname^1.3",
          ],

          "default_operator":"and",
          "flags":"AND|OR|NOT|PHRASE|PRECEDENCE"
        }
      }
    }
  }
}'

this returns no results

However,

curl -XGET 'http://0.0.0.0:9200/users/_search"; -d '{
  "query": {
    "bool": {
      "must": {
        "simple_query_string": {

          "query":"daniel nill",
          "fields":[
            "lastname^6.5",
            "firstname^1.3",
          ],

          "default_operator":"and"
        }
      }
    }
  }
}'

This returns results.

Any idea what I'm missing?

This is on 1.5.1

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