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Java heap space
java.lang.OutOfMemoryError: Java heap space	at java.lang.String.(	at	at org.apache.lucene.index.FieldsReader.addFieldForMerge(	at org.apache.lucene.index.FieldsReader.doc(	at org.apache.lucene.index.SegmentReader.document(	at org.apache.lucene.index.SegmentMerger.mergeFields(	at org.apache.lucene.index.SegmentMerger.merge(	at org.apache.lucene.index.IndexWriter.mergeSegments(	at org.apache.lucene.index.IndexWriter.optimize(