public Builder clearProductCategory() {
      productCategory_ = getDefaultInstance().getProductCategory();
      bitField0_ = (bitField0_ & ~0x00000008);
      onChanged();
      return this;
    }
<pre>
Immutable. The category for the product identified by the reference image.
This should be either "homegoods-v2", "apparel-v2", or "toys-v2". The
legacy categories "homegoods", "apparel", and "toys" are still supported,
but these should not be used for new products.
</pre>

<code>string product_category = 4 [(.google.api.field_behavior) = IMMUTABLE];</code>

@return This builder for chaining.
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/Product.java