increase queue size of import thread

src/main/java/de/komoot/photon/nominatim/ImportThread.java

@@ -16,7 +16,7 @@ class ImportThread {
 
     private static final int PROGRESS_INTERVAL = 50000;
     private static final NominatimResult FINAL_DOCUMENT = new NominatimResult(new PhotonDoc(0, null, 0, null, null));
-    private final BlockingQueue<NominatimResult> documents = new LinkedBlockingDeque<>(20);
+    private final BlockingQueue<NominatimResult> documents = new LinkedBlockingDeque<>(10000);
     private final AtomicLong counter = new AtomicLong();
     private final Importer importer;
     private final Thread thread;