Why does the "boost" not affect the score?

1_setup.txt

## In the 2 queries below, the documents have the same score, despite the 2nd query having a boost.

curl -X DELETE 'localhost:9200/test?pretty=1'

curl -X POST 'localhost:9200/test/foo?pretty=1' -d '{ name: "Nick Hoffman" }'
curl -X POST 'localhost:9200/test/foo?pretty=1' -d '{ name: "John Smith" }'
curl -X POST 'localhost:9200/test/foo?pretty=1' -d '{ name: "Nick Other" }'

curl -X POST 'localhost:9200/test/_refresh?pretty=1'

2_query_with_no_boost.txt

 curl 'localhost:9200/test/foo/_search?pretty=1&explain=0' -d '{
  "query":{
    "dis_max":{
      "queries":[
        { "text": { "name": { "query": "Nick" } } }
      ]
    }
  }
}'

{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 0.625,
    "hits" : [ {
      "_index" : "test",
      "_type" : "foo",
      "_id" : "_BkZVgcnSOyHPwlovRQ8MQ",
      "_score" : 0.625, "_source" : { name: "Nick Hoffman" }
    }, {
      "_index" : "test",
      "_type" : "foo",
      "_id" : "CQTtPq7MQxan5mWXvZ6OuQ",
      "_score" : 0.625, "_source" : { name: "Nick Other" }
    } ]
  }
}

3_query_with_boost.txt

 curl 'localhost:9200/test/foo/_search?pretty=1&explain=0' -d '{
  "query":{
    "dis_max":{
      "queries":[
        { "text": { "name": { "query": "Nick", "boost": 10 } } }
      ]
    }
  }
}'

{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 0.625,
    "hits" : [ {
      "_index" : "test",
      "_type" : "foo",
      "_id" : "_BkZVgcnSOyHPwlovRQ8MQ",
      "_score" : 0.625, "_source" : { name: "Nick Hoffman" }
    }, {
      "_index" : "test",
      "_type" : "foo",
      "_id" : "CQTtPq7MQxan5mWXvZ6OuQ",
      "_score" : 0.625, "_source" : { name: "Nick Other" }
    } ]
  }
}

4_query_with_custom_score_query_boost.txt

curl 'localhost:9200/test/foo/_search?pretty=1&explain=0' -d '{
  "query":{
    "dis_max":{
      "queries":[
         { "custom_score" : { "query" : { "text": { "name": { "query": "Nick" } } }, "script" : "_score", "boost" : 10 } }
      ]
    }
  }
}'

{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 6.25,
    "hits" : [ {
      "_index" : "test",
      "_type" : "foo",
      "_id" : "_BkZVgcnSOyHPwlovRQ8MQ",
      "_score" : 6.25, "_source" : { name: "Nick Hoffman" }
    }, {
      "_index" : "test",
      "_type" : "foo",
      "_id" : "CQTtPq7MQxan5mWXvZ6OuQ",
      "_score" : 6.25, "_source" : { name: "Nick Other" }
    } ]
  }
}

5_queries_with_boost_and_custom_score_boost.txt

curl 'localhost:9200/test/foo/_search?pretty=1&explain=1' -d '{
 "query": { "custom_score" : { "query" : { "text": { "name": { "query": "Nick", "boost" : 10 } } }, "script" : "_score", "boost" : 2 } }
}'
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 1.25,
    "hits" : [ {
      "_shard" : 0,
      "_node" : "dUt-dD8WSRuSdrQQrCcwEw",
      "_index" : "test",
      "_type" : "foo",
      "_id" : "_BkZVgcnSOyHPwlovRQ8MQ",
      "_score" : 1.25, "_source" : { name: "Nick Hoffman" },
      "_explanation" : {
        "value" : 1.25,
        "description" : "custom score, product of:",
        "details" : [ {
          "value" : 0.625,
          "description" : "script score function: product of:",
          "details" : [ {
            "value" : 0.625,
            "description" : "fieldWeight(name:nick in 0), product of:",
            "details" : [ {
              "value" : 1.0,
              "description" : "tf(termFreq(name:nick)=1)"
            }, {
              "value" : 1.0,
              "description" : "idf(docFreq=2, maxDocs=3)"
            }, {
              "value" : 0.625,
              "description" : "fieldNorm(field=name, doc=0)"
            } ]
          } ]
        }, {
          "value" : 2.0,
          "description" : "queryBoost"
        } ]
      }
    }, {
      "_shard" : 0,
      "_node" : "dUt-dD8WSRuSdrQQrCcwEw",
      "_index" : "test",
      "_type" : "foo",
      "_id" : "CQTtPq7MQxan5mWXvZ6OuQ",
      "_score" : 1.25, "_source" : { name: "Nick Other" },
      "_explanation" : {
        "value" : 1.25,
        "description" : "custom score, product of:",
        "details" : [ {
          "value" : 0.625,
          "description" : "script score function: product of:",
          "details" : [ {
            "value" : 0.625,
            "description" : "fieldWeight(name:nick in 0), product of:",
            "details" : [ {
              "value" : 1.0,
              "description" : "tf(termFreq(name:nick)=1)"
            }, {
              "value" : 1.0,
              "description" : "idf(docFreq=2, maxDocs=3)"
            }, {
              "value" : 0.625,
              "description" : "fieldNorm(field=name, doc=0)"
            } ]
          } ]
        }, {
          "value" : 2.0,
          "description" : "queryBoost"
        } ]
      }
    } ]
  }
}


curl 'localhost:9200/test/foo/_search?pretty=1&explain=1' -d '{
 "query": { "custom_score" : { "query" : { "text": { "name": { "query": "Nick", "boost" : 10 } } }, "script" : "_score", "boost" : 3 } }
}'
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 1.8750002,
    "hits" : [ {
      "_shard" : 0,
      "_node" : "dUt-dD8WSRuSdrQQrCcwEw",
      "_index" : "test",
      "_type" : "foo",
      "_id" : "_BkZVgcnSOyHPwlovRQ8MQ",
      "_score" : 1.8750002, "_source" : { name: "Nick Hoffman" },
      "_explanation" : {
        "value" : 1.8750002,
        "description" : "custom score, product of:",
        "details" : [ {
          "value" : 0.62500006,
          "description" : "script score function: product of:",
          "details" : [ {
            "value" : 0.62500006,
            "description" : "weight(name:nick^10.0 in 0), product of:",
            "details" : [ {
              "value" : 1.0000001,
              "description" : "queryWeight(name:nick^10.0), product of:",
              "details" : [ {
                "value" : 10.0,
                "description" : "boost"
              }, {
                "value" : 1.0,
                "description" : "idf(docFreq=2, maxDocs=3)"
              }, {
                "value" : 0.10000001,
                "description" : "queryNorm"
              } ]
            }, {
              "value" : 0.625,
              "description" : "fieldWeight(name:nick in 0), product of:",
              "details" : [ {
                "value" : 1.0,
                "description" : "tf(termFreq(name:nick)=1)"
              }, {
                "value" : 1.0,
                "description" : "idf(docFreq=2, maxDocs=3)"
              }, {
                "value" : 0.625,
                "description" : "fieldNorm(field=name, doc=0)"
              } ]
            } ]
          } ]
        }, {
          "value" : 3.0,
          "description" : "queryBoost"
        } ]
      }
    }, {
      "_shard" : 0,
      "_node" : "dUt-dD8WSRuSdrQQrCcwEw",
      "_index" : "test",
      "_type" : "foo",
      "_id" : "CQTtPq7MQxan5mWXvZ6OuQ",
      "_score" : 1.8750002, "_source" : { name: "Nick Other" },
      "_explanation" : {
        "value" : 1.8750002,
        "description" : "custom score, product of:",
        "details" : [ {
          "value" : 0.62500006,
          "description" : "script score function: product of:",
          "details" : [ {
            "value" : 0.62500006,
            "description" : "weight(name:nick^10.0 in 0), product of:",
            "details" : [ {
              "value" : 1.0000001,
              "description" : "queryWeight(name:nick^10.0), product of:",
              "details" : [ {
                "value" : 10.0,
                "description" : "boost"
              }, {
                "value" : 1.0,
                "description" : "idf(docFreq=2, maxDocs=3)"
              }, {
                "value" : 0.10000001,
                "description" : "queryNorm"
              } ]
            }, {
              "value" : 0.625,
              "description" : "fieldWeight(name:nick in 0), product of:",
              "details" : [ {
                "value" : 1.0,
                "description" : "tf(termFreq(name:nick)=1)"
              }, {
                "value" : 1.0,
                "description" : "idf(docFreq=2, maxDocs=3)"
              }, {
                "value" : 0.625,
                "description" : "fieldNorm(field=name, doc=0)"
              } ]
            } ]
          } ]
        }, {
          "value" : 3.0,
          "description" : "queryBoost"
        } ]
      }
    } ]
  }
}