Github user yanboliang commented on the issue:

    https://github.com/apache/spark/pull/17867
  
    Yeah, that's because we didn't always do that in time, especially for 
spark.mllib packages which has been in maintenance mode. But for spark.ml 
package, I think we always keep to remove methods deprecated in last 
feature/minor release. And we have already warned ```This method is deprecated 
and will be removed in 2.2.0``` in API documents, it may confuse users if we 
don't take action follow the API annotation. I'm prefer to merge this as the 
old convention, and start the new convention in the following release which we 
should add annotation like ```deprecated and will be removed in 3.0.0```. What 
do you think about it? Thanks.


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