如何從使用Apache的索引讀取器獲取最頻繁的術語lucene 6.4.0

Question

似乎Apache Lucene api正在從每個版本進行更改。我如何從Apache lucene 6.4.0的IndexReader獲得最頻繁的術語。

只見Get highest frequency terms from Lucene index這是不是與Apache Lucene的6.4.0

Answer 1

這將爲Lucene的6.4工作的代碼非常有用。它找到了所有領域中最頻繁的術語，用於分別查找字段中最頻繁的術語調整代碼。

 IndexReader reader = DirectoryReader.open(dir); 
     final Fields fields = MultiFields.getFields(reader); 
     final Iterator<String> iterator = fields.iterator(); 

     long maxFreq = Long.MIN_VALUE; 
     String freqTerm = ""; 
     while(iterator.hasNext()) { 
      final String field = iterator.next(); 
      final Terms terms = MultiFields.getTerms(reader, field); 
      final TermsEnum it = terms.iterator(); 
      BytesRef term = it.next(); 
      while (term != null) { 
       final long freq = it.totalTermFreq(); 
       if (freq > maxFreq) { 
        maxFreq = freq; 
        freqTerm = term.utf8ToString(); 
       } 
       term = it.next(); 
      } 
     } 

     System.out.println(freqTerm + " " + maxFreq);