elasticsearch - 查询时间上的Latenise token

Question

我需要对查询(或过滤)时使用的查询 token 进行后期处理。我可以在应用程序级别执行此操作，但我想知道Elasticsearch是否提供了开箱即用的解决方案。

我正在使用ES 1.7.5(作为服务)

Answer 1

默认情况下，elasticsearch将在索引时间和查询时间使用相同的分析器，但是可以指定 search_analyzer ，它仅在查询时使用。

让我们看下面的例子:

# First we define an analyzer which will fold non ascii characters called `latinize`.
PUT books
{
  "settings": {
    "analysis": {
      "analyzer": {
        "latinize": {
          "tokenizer": "standard",
          "filter": ["asciifolding"]
        }
      }
    }
  },
  "mappings": {
    "book": {
      "properties": {
        "name": {
          "type": "string", 
          "analyzer": "standard",       # We use the standard analyzer at index time.
          "search_analyzer": "latinize" # But we use the latinize analyzer at query time.
        }
      }
    }
  }
}

# Now let's create a document and search for it with a non latinized string.
POST books/book
{
  "name": "aaoaao"
}

POST books/_search
{
  "query": {
    "match": {
      "name": "ääöääö"
    }
  }
}

和ba!有我们的文件。

{
  "took": 3,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 0.30685282,
    "hits": [
      {
        "_index": "books",
        "_type": "book",
        "_id": "AVkIXdNyDpmDHTvI6Cp1",
        "_score": 0.30685282,
        "_source": {
          "name": "aaoaao"
        }
      }
    ]
  }
}