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The reverse index contains a mapping from word to document id.
There are two tiers of this index, one priority index which only indexes terms that are flagged with priority flags<sup>1</sup>,
and a full index that indexes all terms. The full index also provides access to term-level metadata, while the priority
index is a binary index.
There are two tiers of this index.
* A priority index which only indexes terms that are flagged with priority flags<sup>1</sup>.
* A full index that indexes all terms.
The full index also provides access to term-level metadata, while the priority index is a binary index that only offers information about which documents has a specific word.
[1] See WordFlags in [common/model](../../common/model/) and
KeywordMetadata in [features-convert/keyword-extraction](../../features-convert/keyword-extraction).