public Builder clearRetailProductRecognitionIndex() {
        retailProductRecognitionIndex_ = getDefaultInstance().getRetailProductRecognitionIndex();
        bitField0_ = (bitField0_ & ~0x00000001);
        onChanged();
        return this;
      }
<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 This builder for chaining.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/CustomProcessorSourceInfo.java