Boost is being ignored when using custom analyzers

Adding data

#!/bin/bash
curl -XPOST 'http://localhost:9200/testing/type1/' -d '{
    "id" : "1",
    "field1" : "This is a test that I am running",
    "field2" : "Hello world"
}'
curl -XPOST 'http://localhost:9200/testing/type1/' -d '{
    "id" : "2",
    "field1" : "Hello world",
    "field2" : "This is a test that I am running"
}'

Query and Result

curl "localhost:9200/testing/type1/_search?pretty=true" -d '
{
  "query" : {
    "query_string": {
      "default_field": "_all",
        "query": "test"
    }
  }
}'


RESULT:
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 3,
    "successful" : 3,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 0.06780553,
    "hits" : [ {
      "_index" : "testing",
      "_type" : "type1",
      "_id" : "wc606PqtSjqXtS9-sfwmQA",
      "_score" : 0.06780553, "_source" : {
    "id" : "1",
    "field1" : "This is a test that I am running",
    "field2" : "Hello world"
}
    }, {
      "_index" : "testing",
      "_type" : "type1",
      "_id" : "iR_Y4RraTnKd4deTaMn7HQ",
      "_score" : 0.06780553, "_source" : {
    "id" : "2",
    "field1" : "Hello world",
    "field2" : "This is a test that I am running"
}
    } ]
  }
}

Template

curl -XPUT localhost:9200/_template/test_template -d '
{
  "template" : "test*",
  "settings" : {
    "index" : {
      "number_of_shards" : 3,
      "analysis" : {
        "filter" : {
          "simple_word_del_filter" : {
            "type" : "word_delimiter",
            "generate_word_parts" : false,
            "generate_number_parts" : false,
            "split_on_case_change" : false,
            "preserve_original" : true,
            "split_on_numerics" : false,
            "stem_english_possessive" : false
          },
          "min_len_filter" : {
            "type" : "length",
            "min" : 2
          }
        },
        "analyzer" : {
          "aph_analyzer" : {
            "filter" : ["lowercase", "simple_word_del_filter", "min_len_filter"],
            "type" : "custom",
            "tokenizer" : "whitespace",
            "char_filter" : "html_strip"
          },
          "ws_lc_analyzer" : {
            "tokenizer" : "whitespace",
            "filter" : ["lowercase"]
          }
        }
      }
    }

  },
  "mappings" : {
    "type1" : {
      "_source" : {
        "enabled" : true
      },
      "_all" : {
        "enabled" : true,
        "index_analyzer" : "aph_analyzer",
        "search_analyzer" : "ws_lc_analyzer"
      },
      "properties" : {
        "id" : {
          "type" : "string",
          "index" : "not_analyzed"
        },
        "field1" : {
          "type" : "string",
          "index" : "analyzed",
          "index_analyzer" : "aph_analyzer",
          "search_analyzer" : "ws_lc_analyzer",
          "boost" : 10
        },
        "field2" : {
          "type" : "string",
          "index" : "analyzed",
          "index_analyzer" : "aph_analyzer",
          "search_analyzer" : "ws_lc_analyzer"
        }
      }
    }
  }
}
'