Use unicode strings in data generation by default

Author: jordan-powers

test/framework/src/main/java/org/elasticsearch/datageneration/datasource/DefaultObjectGenerationHandler.java

@@ -15,9 +15,9 @@
 import java.util.Optional;
 import java.util.Set;
 
-import static org.elasticsearch.test.ESTestCase.randomAlphaOfLengthBetween;
 import static org.elasticsearch.test.ESTestCase.randomDouble;
 import static org.elasticsearch.test.ESTestCase.randomIntBetween;
+import static org.elasticsearch.test.ESTestCase.randomRealisticUnicodeOfCodepointLengthBetween;
 
 public class DefaultObjectGenerationHandler implements DataSourceHandler {
     @Override
@@ -49,7 +49,7 @@ public boolean generateRegularSubObject() {
 
             @Override
             public String generateFieldName() {
-                return randomAlphaOfLengthBetween(1, 10);
+                return randomRealisticUnicodeOfCodepointLengthBetween(1, 10);
             }
         };
     }

test/framework/src/main/java/org/elasticsearch/datageneration/datasource/DefaultPrimitiveTypesHandler.java

@@ -59,7 +59,7 @@ public DataSourceResponse.HalfFloatGenerator handle(DataSourceRequest.HalfFloatG
 
     @Override
     public DataSourceResponse.StringGenerator handle(DataSourceRequest.StringGenerator request) {
-        return new DataSourceResponse.StringGenerator(() -> ESTestCase.randomAlphaOfLengthBetween(0, 50));
+        return new DataSourceResponse.StringGenerator(() -> ESTestCase.randomRealisticUnicodeOfCodepointLengthBetween(0, 50));
     }
 
     @Override