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java.lang.OutOfMemoryError: Java heap space	at java.lang.AbstractStringBuilder.(AbstractStringBuilder.java:68)	at java.lang.StringBuilder.(StringBuilder.java:101)	at org.elasticsearch.common.logging.support.LoggerMessageFormat.format(LoggerMessageFormat.java:52)	at org.elasticsearch.common.logging.support.AbstractESLogger.warn(AbstractESLogger.java:109)	at org.elasticsearch.transport.netty.NettyInternalESLogger.warn(NettyInternalESLogger.java:83)	at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:340)	at org.jboss.netty.channel.socket.nio.NioClientBoss.run(NioClientBoss.java:42)	at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)	at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)