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Martijn found a bug in IndexUpgraderMergePolicy which attributes fieldInfos.size() as a field number although this field number might already be taken in the current segment.
Fix field number attribution to _version.
IndexUpgraderMergePolicy assumed that field numbers were dense and that
fieldInfos.size() was a free field number. This can however be wrong for a
segment which doesn't have one or more fields that some older segments have.