Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12968#discussion_r62428404
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/feature/StopWordsRemover.scala ---
    @@ -73,22 +75,37 @@ class StopWordsRemover(override val uid: String)
       /** @group getParam */
       def getCaseSensitive: Boolean = $(caseSensitive)
     
    -  setDefault(stopWords -> 
StopWordsRemover.loadDefaultStopWords("english"), caseSensitive -> false)
    +  /**
    +   * Locale for doing a case sensitive comparison
    +   * Default: English locale ("en")
    +   * @group param
    +   */
    +  val locale: Param[String] = new Param[String](this, "locale",
    --- End diff --
    
    For supported languages, we can know the appropriate locale and maintain an 
internal mapping. So "french" is known to map to `Locale.FRENCH`. For loading 
an arbitrary list, we don't know, but you could provide an overload where you 
provide a `Locale`.


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