MultiNodeDistributedTest.testIndexingWorkDistribution fails randomly

junit.framework.AssertionFailedError: expected:<5> but was:<4>
    at junit.framework.Assert.fail(Assert.java:50)
    at junit.framework.Assert.failNotEquals(Assert.java:287)
    at junit.framework.Assert.assertEquals(Assert.java:67)
    at junit.framework.Assert.assertEquals(Assert.java:199)
    at junit.framework.Assert.assertEquals(Assert.java:205)
    at org.infinispan.query.distributed.MultiNodeDistributedTest.assertIndexSize(MultiNodeDistributedTest.java:119)
    at org.infinispan.query.distributed.MultiNodeDistributedTest.testIndexingWorkDistribution(MultiNodeDistributedTest.java:85)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
    at org.testng.TestRunner.privateRun(TestRunner.java:767)
    at org.testng.TestRunner.run(TestRunner.java:617)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
    at org.testng.SuiteRunner.access$000(SuiteRunner.java:37)
    at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:368)
    at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:662)
------- Stdout: -------
[testng-MultiNodeDistributedTest] Test testIndexingWorkDistribution(org.infinispan.query.distributed.MultiNodeDistributedTest) failed.
Test suite progress: tests succeeded: 70, failed: 1, skipped: 0.