java.io.IOException: There is not enough space on the disk
   at java.io.RandomAccessFile.writeBytes(RandomAccessFile.java:0)
   at java.io.RandomAccessFile.write(RandomAccessFile.java:525)
   at org.apache.lucene.store.FSDirectory$FSIndexOutput.flushBuffer(FSDirectory.java:448)
   at org.apache.lucene.store.BufferedIndexOutput.flushBuffer(BufferedIndexOutput.java:99)
   at org.apache.lucene.store.BufferedIndexOutput.flush(BufferedIndexOutput.java:88)
   at org.apache.lucene.store.BufferedIndexOutput.close(BufferedIndexOutput.java:113)
   at org.apache.lucene.store.FSDirectory$FSIndexOutput.close(FSDirectory.java:458)
   at org.apache.lucene.util.IOUtils.close(IOUtils.java:141)
   at org.apache.lucene.index.FieldsWriter.close(FieldsWriter.java:139)
   at org.apache.lucene.index.SegmentMerger.mergeFields(SegmentMerger.java:232)
   at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:107)
   at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4263)
   at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3908)
   at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:388)
Caused: org.apache.lucene.index.MergePolicy$MergeException: java.io.IOException: There is not enough space on the disk
   at org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:509)
   at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:482)