无法匹配 haystack 弹性搜索中的数字

Question

我有一些产品要编入索引，例如“99% 巧克力”。如果我搜索巧克力，它匹配这个特定的项目，但如果我搜索“99”，它不匹配。我遇到了这个Using django haystack autocomplete with elasticsearch to search for digits/numbers?，它有同样的问题，但没有人回答他的问题。有人可以帮忙吗？

Edit2：很抱歉我忽略了一个重要的细节。数字搜索本身有效，但自动完成功能无效。我包括相关行：

#the relevant line in my index
    name_auto = indexes.EdgeNgramField(model_attr='name')

#the relevant line in my view
prodSqs = SearchQuerySet().models(Product).autocomplete(name_auto=request.GET.get('q', ''))

编辑：以下是运行分析器的结果：

curl -XGET 'localhost:9200/haystack/_analyze?analyzer=standard&pretty' -d '99% chocolate'
{
  "tokens" : [ {
    "token" : "99",
    "start_offset" : 0,
    "end_offset" : 2,
    "type" : "<NUM>",
    "position" : 1
  }, {
    "token" : "chocolate",
    "start_offset" : 4,
    "end_offset" : 13,
    "type" : "<ALPHANUM>",
    "position" : 2
  } ]
}

Answer 1

终于在这里找到了答案：ElasticSearch: EdgeNgrams and Numbers

添加以下类并更改设置文件中 Haystack_connections 下的引擎以使用下面的 CustomElasticsearchSearchEngine 而不是默认的 haystack 一个：

class CustomElasticsearchBackend(ElasticsearchSearchBackend):
    """
    The default ElasticsearchSearchBackend settings don't tokenize strings of digits the same way as words, so they
    get lost: the lowercase tokenizer is the culprit. Switching to the standard tokenizer and doing the case-
    insensitivity in the filter seems to do the job.
    """
    def __init__(self, connection_alias, **connection_options):
        # see https://stackoverflow.com/questions/13636419/elasticsearch-edgengrams-and-numbers
        self.DEFAULT_SETTINGS['settings']['analysis']['analyzer']['edgengram_analyzer']['tokenizer'] = 'standard'
        self.DEFAULT_SETTINGS['settings']['analysis']['analyzer']['edgengram_analyzer']['filter'].append('lowercase')
        super(CustomElasticsearchBackend, self).__init__(connection_alias, **connection_options)

class CustomElasticsearchSearchEngine(ElasticsearchSearchEngine):
    backend = CustomElasticsearchBackend

Answer 2

通过标准分析器运行字符串 99% chocolate 会得到正确的结果（99 是一个术语），所以如果你目前没有使用它，你应该切换到它。

curl -XGET 'localhost:9200/myindex/_analyze?analyzer=standard&pretty' -d '99% chocolate'
{
  "tokens" : [ {
    "token" : "99",
    "start_offset" : 0,
    "end_offset" : 2,
    "type" : "<NUM>",
    "position" : 1
  }, {
    "token" : "chocolate",
    "start_offset" : 4,
    "end_offset" : 13,
    "type" : "<ALPHANUM>",
    "position" : 2
  } ]
}