SOLR-13855: DistributedZkUpdateProcessor needs to propagate finish() #969
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Passes tests. There's a nocommit comment on wether a distributed scenario should not propagate the finish() call. It was not in the past (checked via null "nodes" field), but I think it should always propagate because even if "nodes" is null processAdd might pass on through a particular document if it's local to the shard receiving the request. @yonik WDYT?