diff --git a/metadata-io/build.gradle b/metadata-io/build.gradle
index ff29cb5fff47d2..17d9cb8cd14fee 100644
--- a/metadata-io/build.gradle
+++ b/metadata-io/build.gradle
@@ -130,6 +130,7 @@ test {
     // override, testng controlling parallelization
     // increasing >1 will merely run all tests extra times
     maxParallelForks = 1
+    environment "ELASTIC_ID_HASH_ALGO", "MD5"
   }
   useTestNG() {
     suites 'src/test/resources/testng.xml'