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org.elasticsearch.index.engine.RefreshFailedEngineException: [mycombat_***][4] Refresh failed at org.elasticsearch.index.engine.robin.RobinEngine.refresh(RobinEngine.java:789) at org.elasticsearch.index.shard.service.InternalIndexShard.refresh(InternalIndexShard.java:412) at org.elasticsearch.index.shard.service.InternalIndexShard$EngineRefresher$1.run(InternalIndexShard.java:699) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636)Caused by: java.io.FileNotFoundException: /var/elasticsearch/elasticsearch/nodes/0/indices/mycombat_***/4/index/_rb.prx (Too many open files) at java.io.RandomAccessFile.open(Native Method) at java.io.RandomAccessFile.<init>(RandomAccessFile.java:233) at org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:441) at org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:306) at org.elasticsearch.index.store.Store$StoreDirectory.createOutput(Store.java:416) at org.elasticsearch.index.store.Store$StoreDirectory.createOutput(Store.java:388) at org.apache.lucene.index.FormatPostingsPositionsWriter.<init>(FormatPostingsPositionsWriter.java:43) at org.apache.lucene.index.FormatPostingsDocsWriter.<init>(FormatPostingsDocsWriter.java:57) at org.apache.lucene.index.FormatPostingsTermsWriter.<init>(FormatPostingsTermsWriter.java:33) at org.apache.lucene.index.FormatPostingsFieldsWriter.<init>(FormatPostingsFieldsWriter.java:51) at org.apache.lucene.index.FreqProxTermsWriter.flush(FreqProxTermsWriter.java:85) at org.apache.lucene.index.TermsHash.flush(TermsHash.java:113) at org.apache.lucene.index.DocInverter.flush(DocInverter.java:70) at org.apache.lucene.index.DocFieldProcessor.flush(DocFieldProcessor.java:60) at org.apache.lucene.index.DocumentsWriter.flush(DocumentsWriter.java:581) at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3623) at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3588) at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:452) at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:401) at org.apache.lucene.index.DirectoryReader.doOpenFromWriter(DirectoryReader.java:428) at org.apache.lucene.index.DirectoryReader.doOpenIfChanged(DirectoryReader.java:448) at org.apache.lucene.index.DirectoryReader.doOpenIfChanged(DirectoryReader.java:396) at org.apache.lucene.index.IndexReader.openIfChanged(IndexReader.java:520) at org.elasticsearch.index.engine.robin.RobinEngine.refresh(RobinEngine.java:764) ... 5 more