Elasticsearch 6.8.5 License JAR for Transport Client

Elastic Stack Elasticsearch
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Starting a transport client in Elasticsearch 6.8.5 results in the following failure. Presumably a client license plugin of some sort is required. What is the Elastic Maven repository URL to download this missing binary?

[2020-01-18T00:45:49,104][WARN ][o.e.d.z.ZenDiscovery     ] [analytics-store-master-a9928e30ab11-8] failed to validate incoming join request from node [{analytics-job-framework-74b1d08c41fd-9}{PP8f1pB5TlyjURD0eeTEaw}{LRPWFZ8XQbafxJf3ScRCeg}{saas-jf-0}{192.168.16.20:9301}]
org.elasticsearch.transport.RemoteTransportException: [analytics-job-framework-74b1d08c41fd-9][192.168.16.20:9301][internal:discovery/zen/join/validate]
Caused by: java.lang.IllegalArgumentException: Unknown NamedWriteable [org.elasticsearch.cluster.metadata.MetaData$Custom][licenses]
	at org.elasticsearch.common.io.stream.NamedWriteableRegistry.getReader(NamedWriteableRegistry.java:112) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.common.io.stream.NamedWriteableAwareStreamInput.readNamedWriteable(NamedWriteableAwareStreamInput.java:45) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.common.io.stream.NamedWriteableAwareStreamInput.readNamedWriteable(NamedWriteableAwareStreamInput.java:39) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.cluster.metadata.MetaData.readFrom(MetaData.java:842) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.cluster.ClusterState.readFrom(ClusterState.java:754) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.discovery.zen.MembershipAction$ValidateJoinRequest.readFrom(MembershipAction.java:177) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.common.io.stream.Streamable.lambda$newWriteableReader$0(Streamable.java:51) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.transport.RequestHandlerRegistry.newRequest(RequestHandlerRegistry.java:56) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.transport.TcpTransport.handleRequest(TcpTransport.java:1042) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.transport.TcpTransport.messageReceived(TcpTransport.java:932) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.transport.TcpTransport.inboundMessage(TcpTransport.java:763) ~[elasticsearch-6.8.5.jar:6.8.5]
	at org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:53) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) ~[?:?]
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323) ~[?:?]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) ~[?:?]
	at io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:241) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) ~[?:?]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) ~[?:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) ~[?:?]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) ~[?:?]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) ~[?:?]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:656) ~[?:?]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:591) ~[?:?]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:508) ~[?:?]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:470) ~[?:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909) ~[?:?]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]
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