在PHP的Elasticsearch中优先考虑前缀匹配

Question

在Elasticsearch中，有没有一种方法为前缀匹配赋予比包含该单词的字符串更高的优先级？

例如-如果要搜索的单词优先级ram应如下所示：

Ram Reddy
Joy Ram Das
Kiran Ram Goel
Swati Ram Goel
Ramesh Singh

我已经尝试过按这里给出的映射。我这样做是这样的：

$params = [
        "index" => $myIndex,
            "body" => [
            "settings"=> [
            "analysis"=> [
                "analyzer"=> [
                "start_with_analyzer"=> [
                    "tokenizer"=> "my_edge_ngram",
                    "filter"=> [
                    "lowercase"
                    ]
                ]
                ],
                "tokenizer"=> [
                "my_edge_ngram"=> [
                    "type"=> "edge_ngram",
                    "min_gram"=> 3,
                    "max_gram"=> 15
                ]
                ]
            ]
            ],
            "mappings"=> [
            "doc"=> [
                "properties"=> [
                "label"=> [
                    "type"=> "text",
                    "fields"=> [
                    "keyword"=> [
                        "type"=> "keyword"
                    ],
                    "ngramed"=> [
                        "type"=> "text",
                        "analyzer"=> "start_with_analyzer"
                    ]
                    ]
                ]
                ]
            ]
            ]
    ]
    ];
    $response = $client->indices()->create($params);    // create an index

并像这样搜索：

$body = [
        "size" => 100,

        '_source' => $select,
        "query"=> [
            "bool"=> [
              "should"=> [
                [
                  "query_string"=> [
                    "query"=> "ram*",
                    "fields"=> [
                      "value"
                    ],
                    "boost"=> 5
                  ]
                ],
                [
                  "query_string"=> [
                    "query"=> "ram*",
                    "fields"=> [
                      "value.ngramed"
                    ],
                    "analyzer"=> "start_with_analyzer",
                    "boost"=> 2
                  ]
                ]
              ],
              "minimum_should_match"=> 1
            ]
          ]
    ];

$params = [
    'index' => $myIndex,
    'type' => $myType,
    'body' => []
];
$params['body'] = $body;
$response = $client->search($params);

查询的json如下：

    {
  "size": 100,
  "_source": [
    "label",
    "value",
    "type",
    "sr"
  ],
  "query": {
    "bool": {
      "should": [
        {
          "query_string": {
            "query": "ram*",
            "fields": [
              "value"
            ],
            "boost": 5
          }
        },
        {
          "query_string": {
            "query": "ram*",
            "fields": [
              "value.ngramed"
            ],
            "analyzer": "start_with_analyzer",
            "boost": 2
          }
        }
      ],
      "minimum_should_match": 1,
      "must_not": {
        "match_phrase": {
          "type": "propertyValue"
        }
      }
    }
  }
}

我正在使用elasticsearch 5.3.2是否有其他方法可以使用php中的search方法对关系数据库中的搜索结果进行排序？