@java.lang.Override
  public com.google.protobuf.ByteString getProductSetBytes() {
    java.lang.Object ref = productSet_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      productSet_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
The resource name of a [ProductSet][google.cloud.vision.v1.ProductSet] to
be searched for similar images.

Format is:
`projects/PROJECT_ID/locations/LOC_ID/productSets/PRODUCT_SET_ID`.
</pre>

<code>string product_set = 6 [(.google.api.resource_reference) = { ... }</code>

@return The bytes for productSet.
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/ProductSearchParams.java