Make minor spec changes for XTable REST Service

[rahil-c]

What is the purpose of the pull request

• Follow up pr regarding spec change for service

Brief change log

• Minor spec changes after landing intial impl of rest service

Verify this pull request

Ran make lint within spec module to confirm no issues with spec syntax.

[rahil-c]

@vinishjail97

[rahil-c]

Ci is failing for similar flaky test behavior around spark setup, which this pr change has no relation too.

[INFO] Running org.apache.xtable.conversion.TestConversionConfig
2025-05-12T18:04:43.7201968Z [ERROR] Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.706 s <<< FAILURE! -- in org.apache.xtable.delta.TestDeltaSync
2025-05-12T18:04:43.7233093Z [ERROR] org.apache.xtable.delta.TestDeltaSync -- Time elapsed: 2.706 s <<< ERROR!
2025-05-12T18:04:43.7235238Z java.net.BindException: Cannot assign requested address: Service 'sparkDriver' failed after 16 retries (on a random free port)! Consider explicitly setting the appropriate binding address for the service 'sparkDriver' (for example spark.driver.bindAddress for SparkDriver) to the correct binding address.
2025-05-12T18:04:43.7237195Z 	at java.base/sun.nio.ch.Net.bind0(Native Method)
2025-05-12T18:04:43.7237727Z 	at java.base/sun.nio.ch.Net.bind(Net.java:459)
2025-05-12T18:04:43.7238217Z 	at java.base/sun.nio.ch.Net.bind(Net.java:448)
2025-05-12T18:04:43.7238969Z 	at java.base/sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:227)
2025-05-12T18:04:43.7240018Z 	at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:141)
2025-05-12T18:04:43.7241399Z 	at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:561)
2025-05-12T18:04:43.7242436Z 	at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1331)
2025-05-12T18:04:43.7243692Z 	at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:600)
2025-05-12T18:04:43.7244888Z 	at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:579)
2025-05-12T18:04:43.7245784Z 	at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:972)
2025-05-12T18:04:43.7246583Z 	at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:259)
2025-05-12T18:04:43.7247324Z 	at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:380)
2025-05-12T18:04:43.7248304Z 	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173)
2025-05-12T18:04:43.7249432Z 	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166)
2025-05-12T18:04:43.7250907Z 	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
2025-05-12T18:04:43.7251941Z 	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569)
2025-05-12T18:04:43.7252872Z 	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:994)
2025-05-12T18:04:43.7253898Z 	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
2025-05-12T18:04:43.7254869Z 	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
2025-05-12T18:04:43.7255688Z 	at java.base/java.lang.Thread.run(Thread.java:829)
2025-05-12T18:04:43.7256220Z 	Suppressed: java.lang.NullPointerException
2025-05-12T18:04:43.7256894Z 		at org.apache.xtable.delta.TestDeltaSync.teardown(TestDeltaSync.java:126)
2025-05-12T18:04:43.7257697Z 		at java.base/java.lang.reflect.Method.invoke(Method.java:566)
2025-05-12T18:04:43.7258393Z 		at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
2025-05-12T18:04:43.7259663Z 		at java.base/java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1085)
2025-05-12T18:04:43.7278114Z 		at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
2025-05-12T18:04:43.7279134Z 		at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
2025-05-12T18:04:43.7280357Z 		at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
2025-05-12T18:04:43.7281275Z 		at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
2025-05-12T18:04:43.7282277Z 		at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)