Directory indexDirectory = FSDirectory.open(new File("/home/ranger/index/1"));        IndexReader indexReader = DirectoryReader.open(indexDirectory);        Fields fields = MultiFields.getFields(indexReader );        Iterator
    
      fieldsIterator = fields.iterator();        while(fieldsIterator.hasNext()){            String field = fieldsIterator.next();            Terms terms = fields.terms(field);            TermsEnum termsEnums = terms.iterator(null);            BytesRef byteRef = null;            System.out.println("field : "+ field);            while((byteRef = termsEnums.next()) != null) {                String term = new String(byteRef.bytes, byteRef.offset, byteRef.length);                System.out.println("term is : " + term);            }        }
    

结果是：

field : ID

term is : 10000

field : name

term is : lettuce