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org.apache.lucene.store.AlreadyClosedException: this ReferenceManager is closed	at org.apache.lucene.search.ReferenceManager.acquire(ReferenceManager.java:98)	at org.apache.lucene.search.SearcherManager.isSearcherCurrent(SearcherManager.java:161)	at org.elasticsearch.index.engine.Engine.refreshNeeded(Engine.java:455)	at org.elasticsearch.index.shard.IndexShard$EngineRefresher$1.run(IndexShard.java:1195)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)