@java.lang.Override
    public com.google.protobuf.ByteString getRetailProductRecognitionIndexBytes() {
      java.lang.Object ref = retailProductRecognitionIndex_;
      if (ref instanceof java.lang.String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        retailProductRecognitionIndex_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
Required. Resource name of RetailProductRecognitionIndex.
Format is
'projects/&#42;&#47;locations/&#42;&#47;retailCatalogs/&#42;&#47;retailProductRecognitionIndexes/&#42;'
</pre>

<code>string retail_product_recognition_index = 1 [(.google.api.field_behavior) = REQUIRED];
</code>

@return The bytes for retailProductRecognitionIndex.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/CustomProcessorSourceInfo.java