elasticsearch - Elasticsearch:如何限制Snowball Analyzer

Question

使用雪球分析仪，当我查询“房屋”时会得到“房屋”的结果。我需要分析器进行大多数搜索，但是在这种情况下，返回值是无关紧要的。我将如何限制分析仪应对这些情况的工作？

Answer 1

您可以通过keyword_marker和stem_exclusion过滤器执行此操作:

Preventing stemming

The stem_exclusion parameter for language analyzers (see Configuring language analyzers) allowed us to specify a list of words that should not be stemmed. Internally, these language analyzers use the keyword_marker token filter to mark the listed words as keywords, which prevents subsequent stemming token filters from touching those words.

http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/controlling-stemming.html

Specifying keywords in a file

While the language analyzers only allow us to specify an array of words in the stem_exclusion parameter, the keyword_marker token filter also accepts a keywords_path parameter which allows us to store all of our keywords in a file. The file should contain one word per line, and must be present on every node in the cluster. See Updating stopwords for tips on how to update this file.

此示例(来自文档)显示了如何实现此目的:

PUT /my_index
{
  "settings": {
    "analysis": {
      "filter": {
        "no_stem": {
          "type": "keyword_marker",
          "keywords": [ "skies" ] 
        }
      },
      "analyzer": {
        "my_english": {
          "tokenizer": "standard",
          "filter": [
            "lowercase",
            "no_stem",
            "porter_stem"
          ]
        }
      }
    }
  }
}

具体情况将因您现有的分析仪设置而异，但这可以助您一臂之力。