Create mixed format bwc index for major releases in addBackcompatIndexes.py [LUCENE-6457]
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legacy-jira-priority:Major
type:enhancement
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Description
An important edge case to test in backcompat tests is a segment infos file written from the current major version, but still containing commits from the previous major version. Right now it a very manual process to create one of these indexes. We should add this to the bwc index creation script, to be run when generating bwc indexes for a major release (X.0.0).
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Migrated from [LUCENE-6457](https://issues.apache.org/jira/browse/LUCENE-6457) by Ryan Ernst (@rjernst)
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