public Builder clearProduct() {
      product_ = getDefaultInstance().getProduct();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
Required. The resource name for the Product to be added to this ProductSet.

Format is:
`projects/PROJECT_ID/locations/LOC_ID/products/PRODUCT_ID`
</pre>

<code>
string product = 2 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
</code>

@return This builder for chaining.
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/AddProductToProductSetRequest.java