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[ML] Improve uniqueness of result document IDs (elastic#50644)
Switch from a 32 bit Java hash to a 128 bit Murmur hash for creating document IDs from by/over/partition field values. The 32 bit Java hash was not sufficiently unique, and could produce identical numbers for relatively common combinations of by/partition field values such as L018/128 and L017/228. Fixes elastic#50613
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