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java.lang.OutOfMemoryError: Java heap space	at org.neo4j.kernel.impl.locking.AbstractLockService.acquireNodeLock(AbstractLockService.java:52)	at org.neo4j.kernel.impl.locking.ReentrantLockService.acquireNodeLock(ReentrantLockService.java:35)	at org.neo4j.kernel.impl.transaction.state.NeoStoreIndexStoreView$NodeStoreScan.run(NeoStoreIndexStoreView.java:212)	at org.neo4j.kernel.impl.api.index.BatchingMultipleIndexPopulator$BatchingStoreScan.run(BatchingMultipleIndexPopulator.java:384)	at org.neo4j.kernel.impl.api.index.IndexPopulationJob.indexAllNodes(IndexPopulationJob.java:138)	at org.neo4j.kernel.impl.api.index.IndexPopulationJob.run(IndexPopulationJob.java:110)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)	at org.neo4j.helpers.NamedThreadFactory$2.run(NamedThreadFactory.java:104)