[BUG] Getting timeout on graceful Shutdown in kinesis source.

[sivagnanam-arumugam]

Describe the bug
When graceful shutdown is called.
Kinesis source shutdown is getting timeout and proceeding with force shutdown.

To Reproduce
Steps to reproduce the behavior:

1. Start the data prepper
2. initiate graceful shutdown
3. Check the kinesis source shutdown log

Expected behavior

1. Timeout exception should not come.
2. Can the GRACEFUL_SHUTDOWN_WAIT_INTERVAL_SECONDS be configurable?

2025-07-18T15:55:58,854 [Thread-1] ERROR org.opensearch.dataprepper.plugins.kinesis.source.KinesisService 
- Exception while executing kinesis consumer graceful shutdown, doing force shutdown 
java.util.concurrent.TimeoutException: null at java.base/java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1892)
 ~[?:?] at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2027) ~[?:?] at 
org.opensearch.dataprepper.plugins.kinesis.source.KinesisService.shutDown(KinesisService.java:144) 
~[kinesis-source-2.12.0-SNAPSHOT.jar:?] at org.opensearch.dataprepper.plugins.kinesis.source.KinesisSource.stop(KinesisSource.java:69)
~[kinesis-source-2.12.0-SNAPSHOT.jar:?] at org.opensearch.dataprepper.core.pipeline.Pipeline.shutdown(Pipeline.java:304) 
~[data-prepper-core-2.12.0-SNAPSHOT.jar:?] at org.opensearch.dataprepper.core.DataPrepper.shutdownPipelines(DataPrepper.java:121) 
~[data-prepper-core-2.12.0-SNAPSHOT.jar:?] at org.opensearch.dataprepper.core.DataPrepper.shutdownPipelines(DataPrepper.java:106) 
~[data-prepper-core-2.12.0-SNAPSHOT.jar:?] at org.opensearch.dataprepper.core.DataPrepper.shutdown(DataPrepper.java:101) 
~[data-prepper-core-2.12.0-SNAPSHOT.jar:?] at org.opensearch.dataprepper.DataPrepperExecute.lambda<span>main</span>0(DataPrepperExecute.java:45) 
~[data-prepper-main-2.12.0-SNAPSHOT.jar:2.12.0-SNAPSHOT] at java.base/java.lang.Thread.run(Thread.java:829) [?:?]

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Environment (please complete the following information):

• OS: [e.g. Ubuntu 20.04 LTS]
• Version [e.g. 22]

Additional context
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