Update "Pipelines and transactions" doc example to include pipeline.close() #4134
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The example PipeTransExample.java is updated to use a try-with-resources block to ensure the pipeline is properly closed after use.
Failing to close pipelines can lead to resource leaks. Specifically, if pipelines are repeatedly created without being closed, and the number of open connections exceeds the maximum allowed by the connection pool, the application will block.
closes #4132