Github user WeichenXu123 commented on a diff in the pull request:
    --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala 
    @@ -90,10 +92,22 @@ class HashingTF @Since("1.4.0") (@Since("1.4.0") 
override val uid: String)
       def setBinary(value: Boolean): this.type = set(binary, value)
    +  /**
    +   * Returns the index of the input term.
    +   */
    +  @Since("2.3.0")
    +  def indexOf(term: Any): Int = {
    +    if (hashingTF != null) {
    +      hashingTF.indexOf(term)
    --- End diff --
    You can move the `feature.HashingTF` initialization into constructor.
    Otherwise the `indexOf` will throw error when `transform` not called, it is 
weird to user.

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