[hotfix] Make Transformation.getTransitivePredecessors() return a list
diff --git a/flink-connectors/flink-connector-elasticsearch6/src/test/java/org/apache/flink/streaming/connectors/elasticsearch6/Elasticsearch6UpsertTableSinkFactoryTest.java b/flink-connectors/flink-connector-elasticsearch6/src/test/java/org/apache/flink/streaming/connectors/elasticsearch6/Elasticsearch6UpsertTableSinkFactoryTest.java
index 582a1d8..29e9d49 100644
--- a/flink-connectors/flink-connector-elasticsearch6/src/test/java/org/apache/flink/streaming/connectors/elasticsearch6/Elasticsearch6UpsertTableSinkFactoryTest.java
+++ b/flink-connectors/flink-connector-elasticsearch6/src/test/java/org/apache/flink/streaming/connectors/elasticsearch6/Elasticsearch6UpsertTableSinkFactoryTest.java
@@ -47,7 +47,6 @@
 import org.elasticsearch.common.xcontent.XContentType;
 import org.junit.Test;
 
-import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -214,7 +213,7 @@
 		}
 
 		@Override
-		public Collection<Transformation<?>> getTransitivePredecessors() {
+		public List<Transformation<?>> getTransitivePredecessors() {
 			return null;
 		}
 
diff --git a/flink-connectors/flink-connector-elasticsearch7/src/test/java/org/apache/flink/streaming/connectors/elasticsearch7/Elasticsearch7UpsertTableSinkFactoryTest.java b/flink-connectors/flink-connector-elasticsearch7/src/test/java/org/apache/flink/streaming/connectors/elasticsearch7/Elasticsearch7UpsertTableSinkFactoryTest.java
index b77d103..099d6ef 100644
--- a/flink-connectors/flink-connector-elasticsearch7/src/test/java/org/apache/flink/streaming/connectors/elasticsearch7/Elasticsearch7UpsertTableSinkFactoryTest.java
+++ b/flink-connectors/flink-connector-elasticsearch7/src/test/java/org/apache/flink/streaming/connectors/elasticsearch7/Elasticsearch7UpsertTableSinkFactoryTest.java
@@ -46,7 +46,6 @@
 import org.elasticsearch.common.xcontent.XContentType;
 import org.junit.Test;
 
-import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -212,7 +211,7 @@
 		}
 
 		@Override
-		public Collection<Transformation<?>> getTransitivePredecessors() {
+		public List<Transformation<?>> getTransitivePredecessors() {
 			return null;
 		}