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Codecs for reading indexes from older versions of Lucene.
用于读取来自旧版本Lucene的索引。
backward-codecs/src/java/org/apache/lucene/codecs/lucene70/Lucene70Codec.java
/**
* Implements the Lucene 7.0 index format, with configurable per-field postings
* and docvalues formats.
* <p>
* If you want to reuse functionality of this codec in another codec, extend
* {@link FilterCodec}.
*
* @see org.apache.lucene.codecs.lucene70 package documentation for file format details.
*
* @lucene.experimental
*/
实现Lucene7.0索引格式化
