WikisResourceIT.testSolrSearch is flickering

expected:<1> but was:<0>

java.lang.AssertionError: expected:<1> but was:<0>
	at org.junit.Assert.fail(Assert.java:89)
	at org.junit.Assert.failNotEquals(Assert.java:835)
	at org.junit.Assert.assertEquals(Assert.java:647)
	at org.junit.Assert.assertEquals(Assert.java:633)
	at org.xwiki.rest.test.WikisResourceIT.testSolrSearch(WikisResourceIT.java:450)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at org.xwiki.test.integration.junit4.ValidateConsoleRule$ValidateConsoleStatement.evaluate(ValidateConsoleRule.java:73)
	at org.xwiki.test.integration.XWikiExecutorSuite.run(XWikiExecutorSuite.java:195)