我们在索引中存储 title
字段,并希望将该字段用于两个目的:
-
我们正在使用ngram过滤器进行分析,因此我们可以提供自动完成和即时结果
-
我们希望能够在
title
字段上使用ASC排序列出结果而不是得分 .
索引/过滤器/分析器的定义如下:
array(
'number_of_shards' => $this->shards,
'number_of_replicas' => $this->replicas,
'analysis' => array(
'filter' => array(
'nGram_filter' => array(
'type' => 'nGram',
'min_gram' => 2,
'max_gram' => 20,
'token_chars' => array('letter','digit','punctuation','symbol')
)
),
'analyzer' => array(
'index_analyzer' => array(
'type' => 'custom',
'tokenizer' =>'whitespace',
'char_filter' => 'html_strip',
'filter' => array('lowercase','asciifolding','nGram_filter')
),
'search_analyzer' => array(
'type' => 'custom',
'tokenizer' =>'whitespace',
'char_filter' => 'html_strip',
'filter' => array('lowercase','asciifolding')
)
)
)
),
当我们对 title
字段进行排序时,我们遇到的问题是无法预测的结果 . 在做了一点搜索之后,我们在ElasticSearch的 sort
手册页的末尾找到了这个...(http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-sort.html#_memory_considerations)
对于基于字符串的类型,不应分析/标记化排序的字段 .
How can we both analyze the field and sort on it later? Do we need to store the field twice with one using not_analyzed in order to sort? Since the field _source is also storing the title value in it's original state, can that not be used to sort on?
1 回答
您可以在Elasticsearch中使用Multi Field Type的内置概念 .
在Elasticsearch Reference中,请查看String Sorting and Multi Fields指南,了解如何设置所需内容 .
请注意,Elasticsearch 0.90.X和1.X之间的多字段映射配置已更改 . 根据您的版本使用适当的以下指南:
0.90 Multi Field Type
1.X Multi Field Type