Random forest score decreased due to updating spark version

Problem description

I use different versions of spark to analyze random forest scores..

• spark-core_2.10 and version 2.0.0

• • RandomForestsKaggle Score = 0.8978765219058574
• spark-core_2.11 and version 2.4.0

• • RandomForestsKaggle Score = 0.8886987035251259

Source :  https://github.com/smartscity/Kaggle_Titanic_spark

Example github source and readme

Introduce

This case is Titanic Competitions on the Kaggle. https://www.kaggle.com/c/titanic

Conclusion

After upgrading the spark version(version 2.4.0), the random forest score dropped(0.01).

Expectation

Expect random forest score not to drop as the version upgrades.