springboot Couchbase auto-configuration integration tests fail intermittently

Could not insert bucket: {"errors":{"name":"Bucket with given name already exists"},"summaries":{"ramSummary":{"total":314572800,"otherBuckets":104857600,"nodesCount":1,"perNodeMegs":100,"thisAlloc":104857600,"thisUsed":0,"free":104857600},"hddSummary":{"total":194686709760,"otherData":146010765547,"otherBuckets":4266773,"thisUsed":0,"free":48671677440}}}
    at com.couchbase.client.java.cluster.DefaultAsyncClusterManager$12.call(DefaultAsyncClusterManager.java:335)
    at com.couchbase.client.java.cluster.DefaultAsyncClusterManager$12.call(DefaultAsyncClusterManager.java:331)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:69)
    at rx.internal.operators.OnSubscribeRedo$2$1.onNext(OnSubscribeRedo.java:244)
    at rx.internal.operators.OperatorMerge$MergeSubscriber.emitScalar(OperatorMerge.java:395)
    at rx.internal.operators.OperatorMerge$MergeSubscriber.tryEmit(OperatorMerge.java:355)
    at rx.internal.operators.OperatorMerge$InnerSubscriber.onNext(OperatorMerge.java:846)
    at rx.observers.Subscribers$5.onNext(Subscribers.java:235)
    at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onNext(OnSubscribeDoOnEach.java:101)
    at rx.internal.producers.SingleProducer.request(SingleProducer.java:65)
    at rx.Subscriber.setProducer(Subscriber.java:211)
    at rx.Subscriber.setProducer(Subscriber.java:205)
    at rx.Subscriber.setProducer(Subscriber.java:205)
    at rx.subjects.AsyncSubject.onCompleted(AsyncSubject.java:103)
    at com.couchbase.client.core.endpoint.AbstractGenericHandler.completeResponse(AbstractGenericHandler.java:508)
    at com.couchbase.client.core.endpoint.AbstractGenericHandler.access$000(AbstractGenericHandler.java:86)
    at com.couchbase.client.core.endpoint.AbstractGenericHandler$1.call(AbstractGenericHandler.java:526)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.lang.Thread.run(Thread.java:834)

With thanks to @bsideup for the recommendation, we may be able to avoid the problem by creating the bucket once the container has started, rather than relying on createNewBucket.