fix compile error

Author: Hendrik Muhs

x-pack/plugin/transform/src/test/java/org/elasticsearch/xpack/transform/transforms/TransformIndexerFailureHandlingTests.java

@@ -505,7 +505,7 @@ public void testInitializeFunction_WithNoWarnings() {
         SourceConfig sourceConfig = new SourceConfig(
             generateRandomStringArray(10, 10, false, false),
             QueryConfigTests.randomQueryConfig(),
-            new HashMap<>() {
+            new HashMap<String, Object>() {
                 {
                     put("field-A", singletonMap("script", "some script"));
                     put("field-B", emptyMap());
@@ -551,7 +551,7 @@ public void testInitializeFunction_WithWarnings() {
         SourceConfig sourceConfig = new SourceConfig(
             generateRandomStringArray(10, 10, false, false),
             QueryConfigTests.randomQueryConfig(),
-            new HashMap<>() {
+            new HashMap<String, Object>() {
                 {
                     put("field-A", singletonMap("script", "some script"));
                     put("field-B", singletonMap("script", "some script"));