Noticed that viwiki didn't get reindexed with everything else in the last batch. Looking back through the logs i found:
Reindex task was not successfull: Failed: [{"index":"viwiki_content_1499849366","shard":3,"node":"vD0XklyiQxO59QHMM-wERQ","reason":{"type":"es_rejected_execution_exception","reason":"r
ejected execution of org.elasticsearch.transport.TcpTransport$RequestHandler@26a9eeed on EsThreadPoolExecutor[search, queue capacity = 1000, org.elasticsearch.common.util.concurrent.Es
ThreadPoolExecutor@727a778d[Running, pool size = 32, active threads = 32, queued tasks = 989, completed tasks = 1075697127]]"}}]Reindex should have seen this and retried a few times, hoping to hit different nodes, rather than giving up and aborting.