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                            # Porter Stem Token Filter（Porter Stem 詞元過濾器）
**porter_stem**?類型的詞元過濾器，根據波特干擾算法轉換詞元流。

請注意，**Porter Stem**?詞元過濾器的輸入必須已經是小寫，所以您需要使用**?[Lower Case Token Filter](http://www.apache.wiki/pages/viewpage.action?pageId=10027085)**?or?**[Lower Case Tokenizer](https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-lowercase-tokenizer.html "Lowercase Tokenizer")**?在之前的分詞器鏈上，以使其正常工作！例如，使用自定義分詞器時，請確保過濾器列表中的?**lowercase?**過濾器位于**porter_stem**?過濾器之前
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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