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Elastic Docs ›Elasticsearch Guide [5.0] ›Analysis ›Token Filters

Lowercase Token Filter

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Lowercase Token Filter

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A token filter of type lowercase that normalizes token text to lower case.

Lowercase token filter supports Greek, Irish, and Turkish lowercase token filters through the language parameter. Below is a usage example in a custom analyzer

index :
    analysis :
        analyzer :
            myAnalyzer2 :
                type : custom
                tokenizer : myTokenizer1
                filter : [myTokenFilter1, myGreekLowerCaseFilter]
                char_filter : [my_html]
        tokenizer :
            myTokenizer1 :
                type : standard
                max_token_length : 900
        filter :
            myTokenFilter1 :
                type : stop
                stopwords : [stop1, stop2, stop3, stop4]
            myGreekLowerCaseFilter :
                type : lowercase
                language : greek
        char_filter :
              my_html :
                type : html_strip
                escaped_tags : [xxx, yyy]
                read_ahead : 1024
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