fix #879 - increase task queue size

Author: sammefford

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

@@ -793,7 +793,7 @@ private class QueryThreadPoolExecutor extends ThreadPoolExecutor {
 
     QueryThreadPoolExecutor(int threadCount, Object objectToNotifyFrom) {
       super(threadCount, threadCount, 0, TimeUnit.MILLISECONDS,
-        new LinkedBlockingQueue<Runnable>(threadCount * 5), new ThreadPoolExecutor.CallerRunsPolicy());
+        new LinkedBlockingQueue<Runnable>(threadCount * 50), new ThreadPoolExecutor.CallerRunsPolicy());
       this.objectToNotifyFrom = objectToNotifyFrom;
     }