fix updated by and createdby field

Author: aarshi0301

repository/src/main/java/org/apache/atlas/repository/store/graph/v2/EntityGraphRetriever.java

@@ -1106,8 +1106,6 @@ private AtlasEntityHeader mapVertexToAtlasEntityHeader(AtlasVertex entityVertex,
             // Common properties
             String typeName = (String) getCommonProperty(vertexProperties, Constants.TYPE_NAME_PROPERTY_KEY);
             String guid = (String) getCommonProperty(vertexProperties, GUID_PROPERTY_KEY);
-            String createdBy = (String) getCommonProperty(vertexProperties, CREATED_BY_KEY);
-            String updatedBy = (String) getCommonProperty(vertexProperties, MODIFIED_BY_KEY);
             Long createTime = (Long) getCommonProperty(vertexProperties, TIMESTAMP_PROPERTY_KEY);
             Long updateTime = (Long) getCommonProperty(vertexProperties, MODIFICATION_TIMESTAMP_PROPERTY_KEY);
             Boolean isIncomplete = isEntityIncomplete(entityVertex);
@@ -1117,8 +1115,8 @@ private AtlasEntityHeader mapVertexToAtlasEntityHeader(AtlasVertex entityVertex,
             ret.setGuid(guid);
             ret.setStatus(GraphHelper.getStatus(entityVertex));
             ret.setIsIncomplete(isIncomplete);
-            ret.setCreatedBy(createdBy);
-            ret.setUpdatedBy(updatedBy);
+            ret.setCreatedBy(GraphHelper.getCreatedByAsString(entityVertex));
+            ret.setUpdatedBy(GraphHelper.getModifiedByAsString(entityVertex));
             ret.setCreateTime(createTime != null ? new Date(createTime) : null);
             ret.setUpdateTime(updateTime != null ? new Date(updateTime) : null);
             ret.setLabels(getLabels(entityVertex));