public Builder clearOperation() {
      operation_ = getDefaultInstance().getOperation();
      bitField0_ = (bitField0_ & ~0x00000001);
      onChanged();
      return this;
    }
<pre>
Output only. The unique operation resource name.
Format: projects/{project}/locations/global/operations/{operation}.
</pre>

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

@return This builder for chaining.
java-storagebatchoperations/proto-google-cloud-storagebatchoperations-v1/src/main/java/com/google/cloud/storagebatchoperations/v1/OperationMetadata.java