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BlockTree terms dictionary.
<p>
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 {@link
org.apache.lucene.codecs.PostingsBaseFormat} to implement the
postings.
</p>
<p>See {@link org.apache.lucene.codecs.blocktree.BlockTreeTermsWriter}
for the file format.
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