public java.lang.String getProductSet() {
      java.lang.Object ref = productSet_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        productSet_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
The resource name of a [ProductSet][google.cloud.vision.v1p3beta1.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 productSet.
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/ProductSearchParams.java