SpringBoot ElasticsearchReactiveHealthIndicator failing in Spring Boot 2.3.2

Spring Boot 2.3.2 spring-data-elasticsearch 4.0.2 ElasticSearch 7.8.0

ElasticsearchReactiveHealthIndicator fails with the below exception.

NOTE 1: my app itself is working with the ES cluster, this is affecting Spring Boot Admin which uses the actuator endpoints NOTE 2: I can go in a browser and hit localhost:9200/_cluster/health and the status shows yellow NOTE 3: Spring Boot 2.3.1 did not have this issue, it looks like this health check was recently added? NOTE 4: ES is setup to require a username/password. When I go to localhost:9200/_cluster/health, Chrome prompts me for a username / password, I enter it and it works.

Application is using RestClientBuilder / RestHighLevelClient with setDefaultCredentialsProvider() to provide the credentials. I'm guessing the health check is not using credentials?

org.springframework.data.elasticsearch.client.NoReachableHostException: Host 'localhost:9200' not reachable. Cluster state is offline.
    at org.springframework.data.elasticsearch.client.reactive.SingleNodeHostProvider.lambda$null$4(SingleNodeHostProvider.java:106) ~[spring-data-elasticsearch-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at reactor.core.publisher.MonoErrorSupplied.call(MonoErrorSupplied.java:76) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:132) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1782) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:144) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:73) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1782) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:144) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:385) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onNext(MonoPeekTerminal.java:173) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.FluxMap$MapConditionalSubscriber.onNext(FluxMap.java:213) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.FluxPeekFuseable$PeekConditionalSubscriber.onNext(FluxPeekFuseable.java:845) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.FluxPeekFuseable$PeekConditionalSubscriber.onNext(FluxPeekFuseable.java:845) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.FluxPeekFuseable$PeekConditionalSubscriber.onNext(FluxPeekFuseable.java:845) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2344) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.MonoFlatMapMany$FlatMapManyMain.onSubscribeInner(MonoFlatMapMany.java:143) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.MonoFlatMapMany$FlatMapManyMain.onNext(MonoFlatMapMany.java:182) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.SerializedSubscriber.onNext(SerializedSubscriber.java:99) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.FluxRetryWhen$RetryWhenMainSubscriber.onNext(FluxRetryWhen.java:162) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.core.publisher.MonoCreate$DefaultMonoSink.success(MonoCreate.java:156) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
    at reactor.netty.http.client.HttpClientConnect$HttpIOHandlerObserver.onStateChange(HttpClientConnect.java:431) ~[reactor-netty-0.9.10.RELEASE.jar:0.9.10.RELEASE]
    at reactor.netty.ReactorNetty$CompositeConnectionObserver.onStateChange(ReactorNetty.java:514) ~[reactor-netty-0.9.10.RELEASE.jar:0.9.10.RELEASE]
    at reactor.netty.resources.PooledConnectionProvider$DisposableAcquire.onStateChange(PooledConnectionProvider.java:540) ~[reactor-netty-0.9.10.RELEASE.jar:0.9.10.RELEASE]
    at reactor.netty.resources.PooledConnectionProvider$PooledConnection.onStateChange(PooledConnectionProvider.java:427) ~[reactor-netty-0.9.10.RELEASE.jar:0.9.10.RELEASE]
    at reactor.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:574) ~[reactor-netty-0.9.10.RELEASE.jar:0.9.10.RELEASE]
    at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:96) ~[reactor-netty-0.9.10.RELEASE.jar:0.9.10.RELEASE]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286) ~[netty-handler-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) ~[netty-codec-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296) ~[netty-codec-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[netty-common-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.51.Final.jar:4.1.51.Final]
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.51.Final.jar:4.1.51.Final]
    at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]