The process of aggregating Javadocs is a bit sketchy in cases where source sets are shared. Particularly that’s the case for Spark and Flink runners.

Considering that everything is thrown into one bucket, we could easily end up with an inconsistent and misleading mix of Javadocs from multiple versions due to version specific overrides.

This disables Javadocs for the Spark2 runner so that aggregateJavadoc doesn't fail.

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