azure-sdk-for-java: [BUG] 429 too many requests to KeyVault are bubbling to UncaughtExceptionHandler

Describe the bug At some point, my application sees a lot of 429 over KeyVault, However, these are reported in the UncaughtExceptionHandler:

com.azure.core.exception.HttpResponseException: Status code 429, "{"error":{"code":"Throttled","message":"Request was not processed because too many requests were received. Reason: VaultOperationLimitReached"}}"
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
	at com.azure.core.http.rest.RestProxy.instantiateUnexpectedException(RestProxy.java:320)
	at com.azure.core.http.rest.RestProxy.lambda$ensureExpectedStatus$3(RestProxy.java:361)
	at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:118)
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1782)
	at reactor.core.publisher.MonoCacheTime$CoordinatorSubscriber.signalCached(MonoCacheTime.java:320)
	at reactor.core.publisher.MonoCacheTime$CoordinatorSubscriber.onNext(MonoCacheTime.java:337)
	at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2344)
	at reactor.core.publisher.MonoCacheTime$CoordinatorSubscriber.onSubscribe(MonoCacheTime.java:276)
	at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:191)
	at reactor.core.publisher.MonoFlatMap.subscribeOrReturn(MonoFlatMap.java:53)
	at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:57)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52)
	at reactor.core.publisher.MonoCacheTime.subscribeOrReturn(MonoCacheTime.java:132)
	at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:57)
	at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150)
	at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114)
	at reactor.core.publisher.FluxDoFinally$DoFinallySubscriber.onNext(FluxDoFinally.java:123)
	at reactor.core.publisher.FluxHandle$HandleSubscriber.onNext(FluxHandle.java:112)
	at reactor.core.publisher.FluxMap$MapConditionalSubscriber.onNext(FluxMap.java:213)
	at reactor.core.publisher.FluxDoFinally$DoFinallySubscriber.onNext(FluxDoFinally.java:123)
	at reactor.core.publisher.FluxHandleFuseable$HandleFuseableSubscriber.onNext(FluxHandleFuseable.java:178)
	at reactor.core.publisher.FluxContextStart$ContextStartSubscriber.onNext(FluxContextStart.java:96)
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1782)
	at reactor.core.publisher.MonoCollectList$MonoCollectListSubscriber.onComplete(MonoCollectList.java:121)
	at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:252)
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:136)
	at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:378)
	at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:373)
	at reactor.netty.channel.ChannelOperations.terminate(ChannelOperations.java:429)
	at reactor.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:645)
	at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:96)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296)
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
	at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1526)
	at io.netty.handler.ssl.SslHandler.decodeNonJdkCompatible(SslHandler.java:1287)
	at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1324)
	at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:501)
	at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:440)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
	at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:792)
	at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:475)
	at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:834)
	Suppressed: java.lang.Exception: #block terminated with an error
		at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:99)
		at reactor.core.publisher.Mono.block(Mono.java:1680)
		at com.azure.security.keyvault.secrets.SecretClient.getSecretWithResponse(SecretClient.java:171)
		at com.azure.security.keyvault.secrets.SecretClient.getSecret(SecretClient.java:133)
		at com.microsoft.azure.keyvault.spring.KeyVaultOperation.lambda$refreshProperties$4(KeyVaultOperation.java:128)
		at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
		at java.base/java.util.ArrayList$Itr.forEachRemaining(ArrayList.java:1033)
		at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
		at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658)
		at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
		at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
		at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
		at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
		at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
		at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
		at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
		at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
		at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
		at com.microsoft.azure.keyvault.spring.KeyVaultOperation.refreshProperties(KeyVaultOperation.java:130)
		at com.microsoft.azure.keyvault.spring.KeyVaultOperation.access$000(KeyVaultOperation.java:29)
		at com.microsoft.azure.keyvault.spring.KeyVaultOperation$1.run(KeyVaultOperation.java:79)
		at java.base/java.util.TimerThread.mainLoop(Timer.java:556)
		at java.base/java.util.TimerThread.run(Timer.java:506)

To Reproduce I guess one just have to go over KeyVault limits.

Expected behavior I would expect the issue to be reported to the main caller (for manual retry), or the issue to be reported as a WARNING (in case of existing automatic retry), with a possible callback or anything else to let me slower my throughtput.

Setup (please complete the following information): azure-spring-boot:2.3.3 azure-security-keyvault-secrets:4.2.0