Hi, We have a solr index running in 4.5.0 that we are trying to upgrade to 4.7.2 and split the shard.

The uniqueKey is a TrieLongField, and it's values are always negative :

Max : -9223372035490849922
Min : -9223372036854609508
When we copy the solr 4.5.0 index to new cluster running 4.7.2 and split the index, the data is duplicated in both new shards.
Any ideas why?
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