Shai Erera created LUCENE-4627:
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Summary: Migration layer for facets
Key: LUCENE-4627
URL: https://issues.apache.org/jira/browse/LUCENE-4627
Project: Lucene - Core
Issue Type: Improvement
Components: modules/facet
Reporter: Shai Erera
Spin-off from LUCENE-4602 (and LUCNE-4623). It will be good if we can develop
some migration layer so that users don't need to re-index their content when we
change how facets are written in the index. Currently the two open issues are
cut over to DV and index drill-down terms w/ DOCS_ONLY, but in the future there
could be other changes.
I don't think that this layer needs to be very heavy. Something in the form of
a FacetsAtomicReaderWrapper. For instance, to support the DV migration, we can
implement a PayloadFacetsAtomicReader which translates the payload to DV API
(i.e. its docValues() API will actually read from the payload).
We'd need some API on IW I think to initialize that reader, so that data can be
migrated from payload to DV during segment merges.
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