tolerate null transformation attrs in field model

Signed-off-by: David Goss <david.goss@matillion.com>

api/src/main/java/marquez/service/models/ColumnLineageInputField.java

@@ -19,6 +19,6 @@ public class ColumnLineageInputField {
   @NotNull private String namespace;
   @NotNull private String dataset;
   @NotNull private String field;
-  @NotNull private String transformationDescription;
-  @NotNull private String transformationType;
+  private String transformationDescription;
+  private String transformationType;
 }

clients/java/src/main/java/marquez/client/models/ColumnLineageInputField.java

@@ -19,6 +19,6 @@ public class ColumnLineageInputField {
   @NonNull private String namespace;
   @NonNull private String dataset;
   @NonNull private String field;
-  @NonNull String transformationDescription;
-  @NonNull String transformationType;
+  private String transformationDescription;
+  private String transformationType;
 }

clients/java/src/test/java/marquez/client/models/ColumnLineageInputFieldTest.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2018-2023 contributors to the Marquez project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package marquez.client.models;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@org.junit.jupiter.api.Tag("UnitTests")
+public class ColumnLineageInputFieldTest {
+    @Test
+    void testToleratesNullTransformationTypeAndDescription() {
+        ColumnLineageInputField field = new ColumnLineageInputField("ns", "ds", "field", null, null);
+
+        assertEquals("ns", field.getNamespace());
+        assertEquals("ds", field.getDataset());
+        assertEquals("field", field.getField());
+        assertNull(field.getTransformationDescription());
+        assertNull(field.getTransformationType());
+    }
+}