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65afa1d93b
RandomScoreFunction previously relied on the order the documents were iterated in from Lucene. This caused changes in ordering, with the same seed, if documents moved to different segments. With this change, a murmur32 hash of the _uid for each document is used as the "random" value. Also, the hash is adjusted so as to only return values between 0.0 and 1.0 to enable easier manipulation to fit into users' scoring models. closes #6907, #7446