| Class | Description | 
|---|---|
| BlockTreeTermsReader | 
 A block-based terms index and dictionary that assigns
  terms to variable length blocks according to how they
  share prefixes. 
 | 
| BlockTreeTermsWriter | 
 Block-based terms index and dictionary writer. 
 | 
| FieldReader | 
 BlockTree's implementation of  
Terms. | 
| Stats | 
 BlockTree statistics for a single field 
 returned by  
FieldReader.getStats(). | 
 This terms dictionary organizes all terms into blocks according to
 shared prefix, such that each block has enough terms, and then stores
 the prefix trie in memory as an FST as the index structure.  It allows
 you to plug in your own PostingsWriterBase to implement the
 postings.
 
See BlockTreeTermsWriter
   for the file format.
 
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