Bruno Roustant created LUCENE-9257:
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Summary: FSTLoadMode should not be BlockTree specific as it is
used more generally in index package
Key: LUCENE-9257
URL: https://issues.apache.org/jira/browse/LUCENE-9257
Project: Lucene - Core
Issue Type: Improvement
Reporter: Bruno Roustant
FSTLoadMode and its associate attribute key (static String) are currently
defined in BlockTreeTermsReader, but they are actually used outside of
BlockTree in the general "index" package.
CheckIndex and ReadersAndUpdates are using these enum and attribute key to
drive the FST load mode through the SegmentReader which is not specific to a
postings format. They have an unnecessary dependency to BlockTreeTermsReader.
We could move FSTLoadMode out of BlockTreeTermsReader, to make it a public enum
of the "index" package. That way CheckIndex and ReadersAndUpdates do not import
anymore BlockTreeTermsReader.
This would also allow other postings formats to use the same enum (e.g.
LUCENE-9254)
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