[CI] ShardChangesIT#testFollowIndex_backlog

[martijnvg]

FAILURE 11.2s J1 | ShardChangesIT.testFollowIndex_backlog <<< FAILURES!
   > Throwable #1: java.lang.AssertionError: 
   > Expected: <2258L>
   >      but: was <2300L>
   >    at __randomizedtesting.SeedInfo.seed([DC85FF589F9FC48A:65A7ED6E8C945A2]:0)
   >    at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
   >    at org.elasticsearch.xpack.ccr.ShardChangesIT.lambda$assertTotalNumberOfOptimizedIndexing$31(ShardChangesIT.java:929)
   >    at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:847)
   >    at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:821)
   >    at org.elasticsearch.xpack.ccr.ShardChangesIT.assertTotalNumberOfOptimizedIndexing(ShardChangesIT.java:913)
   >    at org.elasticsearch.xpack.ccr.ShardChangesIT.testFollowIndex_backlog(ShardChangesIT.java:357)
   >    at java.lang.Thread.run(Thread.java:748)
   >    Suppressed: java.lang.AssertionError: 

FAILURE 14.8s J1 | ShardChangesIT.testFollowIndex_backlog <<< FAILURES!
   > Throwable #1: java.lang.AssertionError: 
   > Expected: <6942L>
   >      but: was <7000L>
   >    at __randomizedtesting.SeedInfo.seed([7C66F5C828D24866:A6B974465F84C94E]:0)
   >    at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
   >    at org.elasticsearch.xpack.ccr.ShardChangesIT.lambda$assertTotalNumberOfOptimizedIndexing$30(ShardChangesIT.java:898)
   >    at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:847)
   >    at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:821)
   >    at org.elasticsearch.xpack.ccr.ShardChangesIT.assertTotalNumberOfOptimizedIndexing(ShardChangesIT.java:882)
   >    at org.elasticsearch.xpack.ccr.ShardChangesIT.testFollowIndex_backlog(ShardChangesIT.java:353)
   >    at java.lang.Thread.run(Thread.java:748)

Build urls:

• https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+6.x+periodic/98/console

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