Update commands to GA (#4658)

Author: davidcavazos

dataflow/flex-templates/streaming_beam/README.md

@@ -155,7 +155,7 @@ and is used to run a new Dataflow job.
 export TEMPLATE_PATH="gs://$BUCKET/samples/dataflow/templates/streaming-beam.json"
 
 # Build the Flex Template.
-gcloud beta dataflow flex-template build $TEMPLATE_PATH \
+gcloud dataflow flex-template build $TEMPLATE_PATH \
   --image "$TEMPLATE_IMAGE" \
   --sdk-language "PYTHON" \
   --metadata-file "metadata.json"
@@ -173,9 +173,11 @@ required by the pipeline.
 
 ```sh
 # Run the Flex Template.
-gcloud beta dataflow flex-template run "streaming-beam-`date +%Y%m%d-%H%M%S`" \
-  --template-file-gcs-location "$TEMPLATE_PATH" \
-  --parameters "input_subscription=$SUBSCRIPTION,output_table=$PROJECT:$DATASET.$TABLE"
+gcloud dataflow flex-template run "streaming-beam-`date +%Y%m%d-%H%M%S`" \
+    --template-file-gcs-location "$TEMPLATE_PATH" \
+    --parameters input_subscription="$SUBSCRIPTION" \
+    --parameters output_table="$PROJECT:$DATASET.$TABLE" \
+    --region "$REGION"
 ```
 
 Check the results in BigQuery by running the following query:

dataflow/flex-templates/streaming_beam/metadata.json

@@ -5,16 +5,16 @@
     {
       "name": "input_subscription",
       "label": "Input PubSub subscription.",
-      "help_text": "Name of the input PubSub subscription to consume from.",
+      "helpText": "Name of the input PubSub subscription to consume from.",
       "regexes": [
         "[a-zA-Z][-_.~+%a-zA-Z0-9]{2,}"
       ]
     },
     {
       "name": "output_table",
       "label": "BigQuery output table name.",
-      "help_text": "Name of the BigQuery output table name.",
-      "is_optional": true,
+      "helpText": "Name of the BigQuery output table name.",
+      "isOptional": true,
       "regexes": [
         "[^:]+:[^.]+[.].+"
       ]