Remove outdated autoscaling language (#513)

* TopWikipediaSessions: remove outdated autoscaling language
* DataflowPipelineWorkerPoolOptions

Author: dhalperi

examples/src/main/java/com/google/cloud/dataflow/examples/complete/TopWikipediaSessions.java

@@ -68,15 +68,6 @@
  *
  * <p>The default input is {@code gs://dataflow-samples/wikipedia_edits/*.json} and can be
  * overridden with {@code --input}.
- *
- * <p>The input for this example is large enough that it's a good place to enable (experimental)
- * autoscaling:
- * <pre>{@code
- *   --autoscalingAlgorithm=BASIC
- *   --maxNumWorkers=20
- * }
- * </pre>
- * This will automatically scale the number of workers up over time until the job completes.
  */
 public class TopWikipediaSessions {
   private static final String EXPORTED_WIKI_TABLE = "gs://dataflow-samples/wikipedia_edits/*.json";

sdk/src/main/java/com/google/cloud/dataflow/sdk/options/DataflowPipelineWorkerPoolOptions.java

@@ -45,7 +45,6 @@ public interface DataflowPipelineWorkerPoolOptions extends PipelineOptions {
   /**
    * Type of autoscaling algorithm to use.
    */
-  @Experimental(Experimental.Kind.AUTOSCALING)
   enum AutoscalingAlgorithmType {
     /** Use numWorkers machines. Do not autoscale the worker pool. */
     NONE("AUTOSCALING_ALGORITHM_NONE"),
@@ -69,7 +68,7 @@ public String getAlgorithm() {
   }
 
   /**
-   * [Experimental] The autoscaling algorithm to use for the workerpool.
+   * The autoscaling algorithm to use for the workerpool.
    *
    * <ul>
    *   <li>NONE: does not change the size of the worker pool.</li>
@@ -78,12 +77,11 @@ public String getAlgorithm() {
    *   </li>
    * </ul>
    */
-  @Description("[Experimental] The autoscaling algorithm to use for the workerpool. "
+  @Description("The autoscaling algorithm to use for the workerpool. "
       + "NONE: does not change the size of the worker pool. "
       + "BASIC (deprecated): autoscale the worker pool size up to maxNumWorkers until the job "
       + "completes. "
       + "THROUGHPUT_BASED: autoscale the workerpool based on throughput (up to maxNumWorkers).")
-  @Experimental(Experimental.Kind.AUTOSCALING)
   AutoscalingAlgorithmType getAutoscalingAlgorithm();
   void setAutoscalingAlgorithm(AutoscalingAlgorithmType value);