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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)	at java.util.HashMap$ValueIterator.next(HashMap.java:922)	at rx.internal.operators.OnSubscribeFromIterable$IterableProducer.request(OnSubscribeFromIterable.java:96)	at rx.Subscriber.setProducer(Subscriber.java:139)	at rx.internal.operators.OnSubscribeFromIterable.call(OnSubscribeFromIterable.java:47)	at rx.internal.operators.OnSubscribeFromIterable.call(OnSubscribeFromIterable.java:33)	at rx.Observable.unsafeSubscribe(Observable.java:7304)	at rx.internal.operators.OperatorMerge$MergeSubscriber.handleNewSource(OperatorMerge.java:188)	at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext(OperatorMerge.java:158)	at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext(OperatorMerge.java:93)	at rx.internal.operators.OperatorMap$1.onNext(OperatorMap.java:55)	at rx.internal.util.ScalarSynchronousObservable$1.call(ScalarSynchronousObservable.java:41)	at rx.internal.util.ScalarSynchronousObservable$1.call(ScalarSynchronousObservable.java:30)	at rx.Observable$1.call(Observable.java:145)	at rx.Observable$1.call(Observable.java:137)	at rx.Observable$1.call(Observable.java:145)	at rx.Observable$1.call(Observable.java:137)	at rx.Observable$1.call(Observable.java:145)	at rx.Observable$1.call(Observable.java:137)	at rx.Observable$1.call(Observable.java:145)	at rx.Observable$1.call(Observable.java:137)	at rx.Observable$1.call(Observable.java:145)	at rx.Observable$1.call(Observable.java:137)	at rx.Observable$1.call(Observable.java:145)	at rx.Observable$1.call(Observable.java:137)	at rx.Observable$1.call(Observable.java:145)	at rx.Observable$1.call(Observable.java:137)	at rx.Observable$1.call(Observable.java:145)	at rx.Observable$1.call(Observable.java:137)	at rx.Observable.subscribe(Observable.java:7393)	at rx.Observable.subscribe(Observable.java:7083)	at com.couchbase.client.core.RequestHandler$1.call(RequestHandler.java:157)	at com.couchbase.client.core.RequestHandler$1.call(RequestHandler.java:151)	at rx.Observable$31.onNext(Observable.java:7139)	at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:130)	at rx.subjects.SubjectSubscriptionManager$SubjectObserver.onNext(SubjectSubscriptionManager.java:224)	at rx.subjects.PublishSubject.onNext(PublishSubject.java:121)	at com.couchbase.client.core.config.DefaultConfigurationProvider.upsertBucketConfig(DefaultConfigurationProvider.java:386)	at com.couchbase.client.core.config.DefaultConfigurationProvider.access$000(DefaultConfigurationProvider.java:91)	at com.couchbase.client.core.config.DefaultConfigurationProvider$7.call(DefaultConfigurationProvider.java:257)	at com.couchbase.client.core.config.DefaultConfigurationProvider$7.call(DefaultConfigurationProvider.java:254)	at rx.internal.operators.OperatorMap$1.onNext(OperatorMap.java:55)	at rx.internal.operators.OperatorDoOnEach$1.onNext(OperatorDoOnEach.java:84)	at rx.internal.operators.OperatorOnErrorResumeNextViaObservable$1.onNext(OperatorOnErrorResumeNextViaObservable.java:64)	at rx.internal.operators.OperatorTake$1.onNext(OperatorTake.java:67)	at rx.internal.operators.OperatorMerge$InnerSubscriber.emit(OperatorMerge.java:635)	at rx.internal.operators.OperatorMerge$InnerSubscriber.onNext(OperatorMerge.java:545)	at rx.internal.operators.OperatorMap$1.onNext(OperatorMap.java:55)	at rx.internal.operators.OperatorMerge$InnerSubscriber.emit(OperatorMerge.java:635)	at rx.internal.operators.OperatorMerge$InnerSubscriber.onNext(OperatorMerge.java:545)	at rx.internal.operators.OperatorMap$1.onNext(OperatorMap.java:55)	at com.couchbase.client.core.utils.Buffers$2$1.onNext(Buffers.java:90)	at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:130)	at rx.subjects.SubjectSubscriptionManager$SubjectObserver.onNext(SubjectSubscriptionManager.java:224)	at rx.subjects.AsyncSubject.onCompleted(AsyncSubject.java:101)	at com.couchbase.client.core.endpoint.AbstractGenericHandler$1.call(AbstractGenericHandler.java:199)	at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:47)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:722)