Fixing thread pool size test failures

Since the Jenkinsfile was mistakenly not using later Java versions correctly, this issue went undetected. The tests pass fine on Java 8, but 11 and higher require the core/max thread pool sizes to be adjusted in a specific order.

Author: rjrudin

marklogic-client-api/src/main/java/com/marklogic/client/datamovement/impl/QueryBatcherImpl.java

@@ -368,9 +368,15 @@ public QueryBatcher withThreadCount(int threadCount) {
       throw new IllegalArgumentException("threadCount must be 1 or greater");
     }
 	if (threadPool != null) {
-		logger.info("Adjusting thread pool size from {} to {}", getThreadCount(), threadCount);
-		threadPool.setCorePoolSize(threadCount);
-		threadPool.setMaximumPoolSize(threadCount);
+		int currentThreadCount = getThreadCount();
+		logger.info("Adjusting thread pool size from {} to {}", currentThreadCount, threadCount);
+		if (threadCount >= currentThreadCount) {
+			threadPool.setMaximumPoolSize(threadCount);
+			threadPool.setCorePoolSize(threadCount);
+		} else {
+			threadPool.setCorePoolSize(threadCount);
+			threadPool.setMaximumPoolSize(threadCount);
+		}
 	} else {
 		threadCountSet = true;
 	}