private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vision.v1p4beta1.ProductSet,
            com.google.cloud.vision.v1p4beta1.ProductSet.Builder,
            com.google.cloud.vision.v1p4beta1.ProductSetOrBuilder>
        getProductSetFieldBuilder() {
      if (productSetBuilder_ == null) {
        productSetBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vision.v1p4beta1.ProductSet,
                com.google.cloud.vision.v1p4beta1.ProductSet.Builder,
                com.google.cloud.vision.v1p4beta1.ProductSetOrBuilder>(
                getProductSet(), getParentForChildren(), isClean());
        productSet_ = null;
      }
      return productSetBuilder_;
    }
<pre>
Required. The ProductSet to create.
</pre>

<code>
.google.cloud.vision.v1p4beta1.ProductSet product_set = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/CreateProductSetRequest.java