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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.(RandomAccessFile.java:233)	at org.apache.lucene.store.FSDirectory$FSIndexOutput.(FSDirectory.java:441)	at org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:306)	at org.elasticsearch.index.store.Store$StoreDirectory.createOutput(Store.java:416)	at org.elasticsearch.index.store.Store$StoreDirectory.createOutput(Store.java:388)	at org.apache.lucene.index.FormatPostingsPositionsWriter.(FormatPostingsPositionsWriter.java:43)	at org.apache.lucene.index.FormatPostingsDocsWriter.(FormatPostingsDocsWriter.java:57)	at org.apache.lucene.index.FormatPostingsTermsWriter.(FormatPostingsTermsWriter.java:33)	at org.apache.lucene.index.FormatPostingsFieldsWriter.(FormatPostingsFieldsWriter.java:51)	at org.apache.lucene.index.FreqProxTermsWriter.flush(FreqProxTermsWriter.java:85)	at org.apache.lucene.index.TermsHash.flush(TermsHash.java:113)	at org.apache.lucene.index.DocInverter.flush(DocInverter.java:70)	at org.apache.lucene.index.DocFieldProcessor.flush(DocFieldProcessor.java:60)	at org.apache.lucene.index.DocumentsWriter.flush(DocumentsWriter.java:581)	at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3623)	at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3588)	at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:452)	at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:401)	at org.apache.lucene.index.DirectoryReader.doOpenFromWriter(DirectoryReader.java:428)	at org.apache.lucene.index.DirectoryReader.doOpenIfChanged(DirectoryReader.java:448)	at org.apache.lucene.index.DirectoryReader.doOpenIfChanged(DirectoryReader.java:396)	at org.apache.lucene.index.IndexReader.openIfChanged(IndexReader.java:520)	at org.elasticsearch.index.engine.robin.RobinEngine.refresh(RobinEngine.java:764)	at org.elasticsearch.index.shard.service.InternalIndexShard.refresh(InternalIndexShard.java:412)	at org.elasticsearch.index.shard.service.InternalIndexShard$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)