java.lang.OutOfMemoryError: Java heap space

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java.lang.OutOfMemoryError: Java heap space
at java.util.ArrayList.iterator(ArrayList.java:834)
at sun.nio.ch.WindowsSelectorImpl.updateSelectedKeys(WindowsSelectorImpl.java:496)
at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:172)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.elasticsearch.common.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:68)
at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.select(AbstractNioSelector.java:415)
at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:212)
at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
at org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
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)

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