Elasticsearch-分析器

1.注册分析器

nalyzer、 tokenizer、 filter可以在elasticsearch.yml 配置

 index :
    analysis :
        analyzer :
            standard :
                type: standard               
                stopwords : [stop1, stop2]
            myAnalyzer1 :
                type: standard               
                stopwords : [stop1, stop2, stop3]
                max_token_length : 500           
            myAnalyzer2 :
                tokenizer : standard
                filter : [standard, lowercase, stop]
        tokenizer :
            myTokenizer1 :
                type: standard               
                max_token_length : 900           
            myTokenizer2 :
                type: keyword             
                buffer_size : 512       
        filter :
            myTokenFilter1 :
                type: stop               
                stopwords : [stop1, stop2, stop3, stop4]
            myTokenFilter2 :
                type: length               
                min : 0               
                max : 2000

analyzer：ES内置若干analyzer, 另外还可以用内置的character filter, tokenizer, token filter组装一个analyzer(custom analyzer)

index :
    analysis :
        analyzer :
            myAnalyzer :
                tokenizer : standard
                filter : [standard, lowercase, stop]

如果你要使用第三方的analyzer插件，需要先在配置文件elasticsearch.yml中注册, 下面是配置IkAnalyzer的例子

  index:
       analysis:
            analyzer:     
                ik:
                  alias: [ik_analyzer]
                  type: org.elasticsearch.index.analysis.IkAnalyzerProvider

当一个analyzer在配置文件中被注册到一个名字(logical name)下后，在mapping定义或者一些API里就可以用这个名字来引用该analyzer了。

二.ES中内置的analyzer,tokenizer,filter

ES内置的一些analyzer

analyzer	logical name	description
standard analyzer	standard	standard tokenizer, standard filter, lower case filter, stop filter
simple analyzer	simple	lower case tokenizer
stop analyzer	stop	lower case tokenizer, stop filter
keyword analyzer	keyword	不分词，内容整体作为一个token(not_analyzed)
pattern analyzer	whitespace	正则表达式分词，默认匹配
language analyzers	lang	各种语言
snowball analyzer	snowball	standard tokenizer, standard filter, lower case filter, stop filter, snowball filter
custom analyzer	custom	一个Tokenizer, 零个或多个Token Filter, 零个或多个Char Filter

tokenizer：ES内置的tokenizer列表

tokenizer	logical name	description
standard tokenizer	standard
edge ngram tokenizer	edgeNGram
keyword tokenizer	keyword	不分词
letter analyzer	letter	按单词分
lowercase analyzer	lowercase	letter tokenizer, lower case filter
ngram analyzers	nGram
whitespace analyzer	whitespace	以空格为分隔符拆分
pattern analyzer	pattern	定义分隔符的正则表达式
uax email url analyzer	uax_url_email	不拆分url和email
path hierarchy analyzer	path_hierarchy	处理类似/path/to/somthing样式的字符串

token filter：ES内置的token filter列表。

token filter	logical name	description
standard filter	standar
dascii folding filter	ascii folding
lengthfilter	length	去掉太长或者太短的
lowercase filter	lowercase	转成小写
ngram filter	nGram
edge ngram filter	edgeNGram
porter stem filter	porterStem	波特词干算法
shingle filter	shingle	定义分隔符的正则表达式
stop filter	stop	移除 stop wordsword
delimiter filter	word_delimiter	将一个单词再拆成子分词
stemmer token filter	stemmer
stemmer override filter	stemmer_override
keyword marker filter	keyword_marker
keyword repeat filter	keyword_repeat
kstem filter	kstem
snowball filter	snowball
phonetic filte	rphonetic	插件
synonym filter	synonyms	处理同义词
compound word filter	dictionary_decompounder, hyphenation_decompounder	分解复合词
reverse filter	reverse	反转字符串
elision filter	elision	去掉缩略语
truncate filter	truncate	截断字符串
unique filter	unique
pattern capture filter	pattern_capture
pattern replace filter	pattern_replace	用正则表达式替换
trim filter	trim	去掉空格
limit token count filter	limit	限制token数量
hunspell filter	hunspell	拼写检查
common grams filter	common_grams
normalization filter	arabic_normalization, persian_normalization

character filter：ES内置的character filter列表

character filter	logical name	description
mapping char filter	mapping	根据配置的映射关系替换字符
html strip char filter	html_strip	去掉HTML元素
pattern replace char filter	pattern_replace	用正则表达式处理字符串