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de2bad9039
This commit adds a new class IndexSorter which handles how a sort should be applied to documents in an index: * how to serialize/deserialize sort info in the segment header * how to sort documents within a segment * how to sort documents from merging segments SortField has a getIndexSorter() method, which will return null if the sort cannot be used to sort an index (eg if it uses scores or other query-dependent values). This also requires a new Codec as there is a change to the SegmentInfoFormat