diff --git a/src/main/java/iudx/resource/server/database/elastic/ElasticClient.java b/src/main/java/iudx/resource/server/database/elastic/ElasticClient.java
index 908b6eca..123864b4 100644
--- a/src/main/java/iudx/resource/server/database/elastic/ElasticClient.java
+++ b/src/main/java/iudx/resource/server/database/elastic/ElasticClient.java
@@ -276,6 +276,7 @@ public ElasticClient scrollAsync(File file, String index, QueryBuilder query, St
       double iterationCount = 0.0;
       double progress;
       while (searchHits != null && searchHits.length > 0) {
+        Thread.sleep(1000);
         LOGGER.debug("results = {} ( {} new)", totalFiles += searchHits.length, searchHits.length);
         iterationCount += 1;
         progress = iterationCount / totalIterations;